Current feedback op-amps

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Not common usage: Inverting G INV −ZZ F ZZ G Z B Z F Z B Z G Z F Z G lim Z →∞ G INV =− Z Z F G
Gain calculation – frequency response G NINV ZZ F ZZ G ZZ G Z B Z F Z B Z G Z F Z G Z B h ib R B 0 1 1s 0 T 1s T /11/ 0 Z T Z 0 1s 1 1s 2 Transimpedance Z T has two poles: due to the impedance of the high Z node and also due to the current mirror delay Z B is the output impedance of the input buffer, small but not necessarily much smaller than Z G
Page 1 and 2: Current feedback op-amps References
Page 3 and 4: How did the idea come about? Supply
Page 5: Basic usage: Non inverting amplifie
Page 9 and 10: Gain vs. frequency with R F (EL5166
Page 11 and 12: Gain bandwidth product - example
Page 13 and 14: Slew rate: VFOA vs CFOA • VFOA:
Page 15 and 16: Avoid capacitances!
Page 17 and 18: Input capacitance
Page 19 and 20: Effect of input (stray) capacitance
Page 21 and 22: Applications I Inverting receiver N
Page 23 and 24: Antenna circuits Coax cable driver
Page 25 and 26: Adjust BW by increasing inverting i
Page 27: Implementation note: Supply bypassi

Current feedback op-amps

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