12.02.2014 Views

Radar System Engineering

Radar System Engineering

Radar System Engineering

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

SEC. 13.6] AMPLIFIERS 493<br />

whence the gain of the entire device is<br />

(1)<br />

If P is large compared to I/GO, variations in GOwill have little effect<br />

on G. Care must be taken, in using large values of GOand ~, that phase<br />

shifts in some of the frequency components do not result in positive feedback<br />

and hence distortion or even oscillation.<br />

The more usual method of representing the circuit is shown in the<br />

lower diagram of Fig. 13.10, where the adding and amplifying are indicated<br />

together.<br />

-++$b+<br />

Tube<br />

Impedance>Z<br />

(a) (b) (c)<br />

Tube<br />

Impedance

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!