Impedance transformer circuit

Details Impedance transformer circuit Impedance transformer circuit

1982-10-20

1985-06-04

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including field effect transistor

330311, H03F 304

Patent

active

045217416

ABSTRACT:
In an impedance transformer circuit which is intended for capacitive voltage sources having a high output impedance, particularly for capacitor microphones, comprises two sequential amplifier stages with an overall gain of close to one. The output of the first amplifier stage having a large input impedance, and of itself, a high gain, is applied to the inverting input 2 of the second amplifier stage V.sub.2, which, of itself, again exhibits a high gain and whose output is fed back to its non-inverting input through at least one feedback loop containing the first amplifier as a resistor controlled by the capacitive transducer. Further, in AC current terms, the load resistor of the first amplifier stage is located between the inverting input and the non-inverting input of the second amplifier stage, and the reference potential "0" for the input and output AC voltage signals is not provided by any of the inverting or non-inverting inputs of the two amplifier stages.

REFERENCES:
patent: 3757214 (1973-09-01), Kime et al.
patent: 4035738 (1977-07-01), Anzalone

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