Bias Circuit

More documents

Recommendations

Info

13.5.3 Signal Current Gain We first compute the open-loop transconductance and then the open-loop current gain. This is done, for a good approximation, by disconnecting the right side of Rf from the souce of M2 and connecting it to ground. (This disables the shunt – series feedback and otherwise alters the circuit only slightly.) The result is Equation 13.17 where Ri = Rs||RG1||Rf. (This assumes that Rf >> RS2 which is consistent with AiI >> 1.) Transconductance Gm is for the complete cascade circuit (open loop), that is, Equation 13.18 Note that the series – series feedback effect is retained in the open-loop computation and that RS2 has been used as an approximation for RS2||Rf. This once again assumes that Rf >> RS2. The loop gain is Equation 13.19 Following the discussion in Unit 11, which led to (11.3), the current gain with feedback is then Equation 13.20 where (ideal current gain of the feedback amplifier) Equation 13.21 As a design example, suppose the design goal is AiI = 10. Assume that the transistors have Vtno = 1 V, kn1 = 1000 µA/V 2 , and kn2 = 2000 µA/V 2 . We select ID1 = 100 µA, ID2 = 200 µA, VDD = 10 V, and VG2 = 3.5 V. From (13.12) and (13.13) we obtain RS2 = 11.4 kΩ and Rf = 103 kΩ. Based on (13.16), the value of RG1 is RG1 = 156 kΩ. To satisfy the drain voltage requirements, RD1 = 65 kΩ and RD2 = 25 kΩ. The latter is based on VD2 = VDD/2. Also, we assume that Rs = 100 kΩ.
The open-loop transconductance is Gm = 3372 µA/V and Ri = 38 kΩ for ai = 129. Loop gain T = 12.9 such that Ai = 9.28. We note that since Ai AiI = 10, the current gain is very predictable, despite bias and parameter variations.
Page 1 and 2:
Copyright Library of Congress Catal
Page 3 and 4:
National Improvements | Virtual Ins
Page 5 and 6:
formulations, the results from Math
Page 7 and 8:
Hardware and Software Requirements
Page 9 and 10:
Chan0_out Pin 21 Chan0_in Pin 68 Gn
Page 11 and 12:
LabVIEW VI Libraries and Project an
Page 13 and 14:
1.1 Resistor Voltage Divider and MO
Page 15 and 16:
1.3 Frequency Response of the Ampli
Page 17 and 18:
At f = flo, . This, by definition,
Page 19 and 20:
1.5 Exercises and Projects Project
Page 21 and 22:
2.1 BJT and MOSFET Schematic Symbol
Page 23 and 24:
2.2 Fundamentals of Signal Amplific
Page 25 and 26:
2.3 Basic NMOS Common-Source Amplif
Page 27 and 28:
Using (2.4), (2.5), (2.9), and (2.1
Page 29 and 30:
Page 31 and 32:
Unit 3. Characterization of MOS Tra
Page 33 and 34:
In electronic circuit applications,
Page 35 and 36:
The output-characteristic equation
Page 37 and 38:
Equation 3.11 From the data measure
Page 39 and 40:
The input circuit loop equation (Fi
Page 41 and 42:
which leads to the result (3.5), re
Page 44 and 45:
Page 46 and 47:
Unit 4. Signal Conductance Paramete
Page 48 and 49:
4.2 Transistor Variable Incremental
Page 50 and 51:
4.3 Transconductance Parameter The
Page 52 and 53:
4.4 Body-Effect Transconductance Pa
Page 54 and 55:
4.5 Output Conductance Parameter Th
Page 56 and 57:
With a 1 - V drop across RS and a 5
Page 58 and 59:
By the nature of the load-line func
Page 60 and 61:
Unit 5. Common-Source Amplifier Sta
Page 62 and 63:
5.2 Amplifier Voltage Gain This dc
Page 64 and 65:
etween the drain and source of the
Page 66 and 67:
5.3 Linearity of the Gain of the Co
Page 68 and 69:
where av Vds/Vgs and where the appr
Page 70 and 71:
is attached directly to the gate. B
Page 72 and 73:
5.5 Design of a Basic Common-Source
Page 74 and 75:
= VGSo - Vtno at the high and low e
Page 76 and 77:
RG can be selected somewhat arbitra
Page 78 and 79:
Page 80 and 81:
6.1 Grounded-Source Amplifier: Coup
Page 82 and 83:
and Equation 6.6 Note that the "RC"
Page 84 and 85:
6.4 Load Coupling Capacitor The com
Page 87 and 88:
6.5 Summary of Equations MOSFET cou
Page 89 and 90:
Unit 7. MOSFET Source-Follower Buff
Page 91 and 92:
7.2 Source-Follower Voltage Transfe
Page 93 and 94:
7.3 Body Effect and Source-Follower
Page 95 and 96:
7.4 Summary of Equations Threshold
Page 97 and 98:
Unit 8. MOSFET Differential Amplifi
Page 99 and 100:
8.2 DC Imbalances In a real transis
Page 101 and 102:
8.3 Signal Voltage Gain of the Idea
Page 103 and 104:
8.4 Effect of the Bias Resistor on
Page 105 and 106:
8.5 Differential Voltage Gain Suppo
Page 107 and 108:
8.7 Voltage Gains Including Transis
Page 109 and 110:
8.7.2 Common-Gate Amplifier Stage T
Page 111 and 112:
with RD1 = RD2 and gm1 = gm2. In th
Page 113 and 114:
It follows that the gain for the in
Page 115 and 116:
8.9 Amplifier Gain with Differentia
Page 117 and 118: 8.11 Summary of Equations Rs = Ris2
Page 119 and 120: 8.12 Exercises and Projects Project
Page 121 and 122: 9.1 Basic Current Source An example
Page 123 and 124: 9.2 Current Source with Source Dege
Page 125 and 126: If the magnitude of the voltage acr
Page 127 and 128: Any slight possible difference in
Page 129 and 130: Unit 10. Common-Source Amplifier wi
Page 131 and 132: 10.2 Signal Voltage Gain The expres
Page 133 and 134: 10.3 Summary of Equations Output dr
Page 135 and 136: Unit 11. Operational Amplifiers wit
Page 137 and 138: 11.1.1 Voltage Gain of the Noninver
Page 139 and 140: This expression can be manipulated
Page 141 and 142: 11.3 Operational Amplifier Offset I
Page 143 and 144: where the approximation usually app
Page 145 and 146: where Avo is the amplifier gain at
Page 149 and 150: 12.1 Operational Amplifier Integrat
Page 151 and 152: This demonstrates that for the circ
Page 153 and 154: with a steady-state value of Vop. A
Page 155 and 156: Equation 12.25 A good estimate come
Page 159 and 160: 13.1 Combining NMOS and PMOS Circui
Page 161 and 162: 13.3 Stabilization of Signal Gain a
Page 163 and 164: An estimate of the new output volta
Page 165 and 166: This produces (9.9) from Ro = Vo/Io
Page 167: Equation 13.13 where 13.12 has been
Page 171 and 172: Unit 14. Development of a Basic CMO
Page 173 and 174: 14.2 Current-Source Output Resistan
Page 175 and 176: 14.3 Current-Source Load for the Co
Page 177 and 178: 14.4 Current-Source Load for the Di
Page 179 and 180: the node (exclusive of the separate
Page 181 and 182: 14.5 Two-Stage Amplifier with Curre
Page 183 and 184: 14.6 Output Buffer Stage It is evid
Page 185 and 186: Suppose that ID6 = 400 µA, W6 = 50
Page 187 and 188: Av and Ro are calculated once, usin
Page 189 and 190: Since the source follower of M1 has
Page 191 and 192: 14.9 Summary of Equations CMRR = 1
Page 193: Unit A. Communicating with the Circ
Page 196 and 197: Place AI Acquire Waveform.vi in the
Page 198 and 199: Click from the Front Panel or Diagr
Page 200 and 201: Now go to the Diagram (under Menu W
Page 202 and 203: To complete connections to the term
Page 204 and 205: Now use the Edit Text Tool to edit
Page 206 and 207: on the left in the diagram . The Wh
Page 208 and 209: Figure A.15. Frame of Sequence Stru
Page 210 and 211: The transition regions are nonabrup
Page 212 and 213: during the oscilloscope measurement
Page 214 and 215: Unit B. Characterization of the Bip
Page 216 and 217: junction diodes, the current is lar
Page 218 and 219:
common to the input and output and
Page 220 and 221:
B.2 Base-Width Dependence on Juncti
Page 222 and 223:
Figure B.8. Diodelike characteristi
Page 224 and 225:
The minus sign comes from having as
Page 226 and 227:
Figure B.10. Circuit for measuring
Page 228 and 229:
B.5 Output Characteristics of BJT i
Page 230 and 231:
After measuring the output characte
Page 232 and 233:
B.6 SPICE Solution for IC versus VC
Page 234 and 235:
B.7 Collector-Emitter Voltage and C
Page 236 and 237:
B.8 DC as a Function of Collector C
Page 238 and 239:
B.10 Summary of Equations Common-em
Page 240 and 241:
Unit C. Common-Emitter Amplifier St
Page 242 and 243:
The equation set above has three un
Page 244 and 245:
The output-resistance parameter, ro
Page 246 and 247:
of βDC as possible. Signal paramet
Page 248 and 249:
Equation C.17 We note that the magn
Page 250 and 251:
C.4 Accuracy of Transistor Gain Mea
Page 252 and 253:
C.5 Effect of Finite Slope of the T
Page 254 and 255:
It follows that for this case, f3dB
Page 256 and 257:
C.7 Common-Emitter Amplifier with A
Page 258 and 259:
Equation C.41 where IC IC(VCE), tha
Page 260 and 261:
Applied voltage Vo sums up to Equat
Page 262 and 263:
C.7.3 DC (Bias) of the NPN - PNP Am
Page 264 and 265:
where Equation C.58 and Equation C.
Page 266 and 267:
Equation C.67 The result is signifi
Page 268 and 269:
The following form of the result pr
Page 270 and 271:
This is equivalent to a unity-gain
Page 272 and 273:
C.11 Summary of Circuit Equations B
Page 274 and 275:
C.12 Exercises and Projects Project
Page 276 and 277:
P1.1 Resistor Voltage-Divider Measu
Page 278 and 279:
• Place AO Update Channel.vi in F
Page 280 and 281:
• (Optional) To install the circu
Page 282 and 283:
Procedure • Set your value of RG2
Page 284 and 285:
• In the Diagram, we will add Get
Page 286 and 287:
P1.4 Resistor Voltage Divider with
Page 288 and 289:
• Now move the capacitor C2 = C1
Page 290 and 291:
P2.1 NMOS Common-Source Circuit wit
Page 292 and 293:
• In the Diagram (below), place,
Page 295 and 296:
P2.2 NMOS Common-Source Amplifier w
Page 297 and 298:
P2.3 Amplifier with Signal and Gain
Page 299 and 300:
• Connect to FG1Chan.vi, the vari
Page 301 and 302:
P3.1 SPICE Parameters and Pin Diagr
Page 303 and 304:
P3.3 PMOS Transistor Use pins 6 (ga
Page 305 and 306:
Procedure • Run PMOSlinear.vi and
Page 307 and 308:
Procedure • Run PMOSparsub.vi wit
Page 309 and 310:
Procedure • Run PMOSparam.vi to r
Page 311 and 312:
Active Region Procedure • Install
Page 313 and 314:
Laboratory Project 4. Characterizat
Page 315 and 316:
P4.2 NMOS Transistor Use CD4007 pin
Page 317 and 318:
P4.4 NMOS Parameters from the Trans
Page 319 and 320:
P4.5 NMOS Lambda from the Transfer
Page 321 and 322:
P4.6 NMOS Gamma SubVI Components No
Page 323 and 324:
• Set RS. With NMOSgamsub.vi open
Page 325 and 326:
• A file can be obtained from the
Page 327 and 328:
P5.1 SPICE Equations and Pin Diagra
Page 330 and 331:
P5.3 Amplifier Gain at One Bias Cur
Page 332 and 333:
P5.4 Amplifier Gain versus Bias Cur
Page 334 and 335:
Laboratory Project 6. PMOS Common-
Page 336 and 337:
P6.2 SPICE PMOS and Circuit Equatio
Page 339 and 340:
P6.4 Amplifier Gain LabVIEW Computa
Page 341 and 342:
P6.5 Amplifier Frequency Response P
Page 343 and 344:
P7.1 Chip Diagram and SPICE Equatio
Page 346 and 347:
P7.3 Amplifier Gain at Optimum Bias
Page 348 and 349:
P7.4 Optimum Bias Stability Test
Page 350 and 351:
P7.5 Amplifier Frequency Response P
Page 352 and 353:
Laboratory Project 8. NMOS Source-
Page 354:
P8.2 Source-Follower DC Evaluation
Page 357 and 358:
available for the next VI. It is us
Page 359 and 360:
Laboratory Project 9. MOSFET Differ
Page 361 and 362:
P9.2 DC Evaluation of the Single-Po
Page 363 and 364:
P9.3 Determination of the PMOS Para
Page 365 and 366:
Gains will be obtained from the gra
Page 367 and 368:
• Run SweepSim.vi to obtain the d
Page 369 and 370:
Laboratory Project 10. Current Mirr
Page 371 and 372:
P10.2 Evaluation of the Current-Sou
Page 373 and 374:
P10.4 Evaluation of the Bias Setup
Page 376 and 377:
Laboratory Project 11. Operational
Page 378 and 379:
P11.2 Bias Circuit Setup 1 Offset N
Page 380 and 381:
P11.3 Opamp Offset Voltage Componen
Page 382 and 383:
P11.4 Evaluation of the Bias Balanc
Page 384 and 385:
VOH • Reset the Chan0_out Range,
Page 386 and 387:
P11.6 Evaluation of the Gain with S
Page 388 and 389:
P11.7 Determination of the Opamp Fr
Page 390 and 391:
Laboratory Project 12. Operational
Page 392 and 393:
P12.2 Opamp Integrator Components R
Page 394 and 395:
Procedure • Turn off the power su
Page 396 and 397:
Laboratory Project A. Communicating
Page 398:
PA.2 Sending and Receiving Voltages
Page 401 and 402:
Bipolar TABLE PA.2 0 to +5V 1.22 mV
Page 403 and 404:
PA.5 Observing the Oscilloscope Out
Page 405 and 406:
of the DAC. The steps are 2.44 mV f
Page 407 and 408:
• The example here illustrates th
Page 409 and 410:
Laboratory Project B. Characterizat
Page 411 and 412:
PB.2 SPICE Equations SPICE Equation
Page 413 and 414:
parameters nF and IS. • Connect C
Page 415 and 416:
PB.4 DC versus the Collector Curren
Page 417 and 418:
• Now open VI, IC_VCE.vi. Set the
Page 419 and 420:
Laboratory Project C1. NPN Common-
Page 421 and 422:
PC.2 DC Circuit Setup and Parameter
Page 423 and 424:
PC.3 Amplifier Gain at One Bias Cur
Page 425 and 426:
PC.4 Amplifier Gain versus Bias Cur
Page 427 and 428:
• Run FreqResp.vi. Verify that in
Page 429 and 430:
PC.6 SPICE Equations and Pin Diagra
Page 431 and 432:
• Determine the value of VAF spec
Page 433 and 434:
• Set the Run Mode switch to Set
Page 435:
• Now reset VCC(init) and VBB(ini
show all

Bias Circuit

Create successful ePaper yourself

Delete template?

Save as template?