H - Electricity – 03 – G
Patent
H - Electricity
03
G
330/101, 330/107
H03G 3/30 (2006.01) G01S 7/34 (2006.01) G01S 7/40 (2006.01) G01S 13/44 (2006.01) H03G 3/00 (2006.01)
Patent
CA 1286735
ABSTRACT OF THE DISCLOSURE An internal impedance dependent amplifier has a gain as determined by the impedance at a predetermined node within the amplifier. A PIN diode is coupled to the predetermined node. The PIN diode is driven with a forward biased current which serves as the accurate gain control (AGC) signal for the amplifer. In the preferred embodiment, the PIN diode is driven by an operational amplifier in such a manner that the impedance thus coupled to the predetemrined node in the amplifier is temperature independent. Becuase the PIN diode has an impedance given by: log R = A + B log Ip, where R is the impedance of the PIN diode; Ip is the forward biasing current; and A and B constants which are different for each PIN diode, the AGC voltage applied to the operational amplifier driving the PIN diode is linear with respect to the impedance of the PIN diode and hence the voltage gain of the impedance controlled amplifier to which the PIN diode is coupled. This characteristic of the gain of the amplifier allows the amplifier to be cascaded in series and to preserve the same impedance relation as expressed above for the cascaded series of amplifiers as well. Thus, the gain in dB of the cascaded series of amplifiers is log linear with respect to a common AGC voltage applied to each of the amplifiers of the series.
518590
Hughes Aircraft Company
Sim & Mcburney
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