Integrated negative D-C bias circuit

Details Integrated negative D-C bias circuit Integrated negative D-C bias circuit

1995-07-14

1997-05-06

Krishnan, Aditya

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

363 61, H02M 318

Patent

active

056274580

ABSTRACT:
A low power amplifier system contains a number of amplifier stages, each having a control terminal, and a bias circuit parameter that can be measured as a voltage. A monolithic integrated circuit includes a plurality of bias control amplifiers, one for each of the amplifier stages. A positive supply voltage is fed into the integrated circuit, and in response thereto a negative supply voltage is generated, both voltages being then applied to each of the bias control amplifiers. A voltage feedback signal indicative of the bias current in each one of the respective external amplifier circuits is supplied to the corresponding one of the bias control amplifiers. Each bias control amplifier is then operable to compare the received voltage feedback signal with a reference voltage derived from the positive supply voltage and/or the negative supply voltage, for producing an error signal indicative of an error in the bias current in the respective external amplifier stage, and also for amplifying that error signal. The amplified error signal is then supplied to the control terminal of the associated amplifier stage to control the bias current.

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(Date Uncertain) Maxim, Inc.--three sheets of product descriptions & advertising literature on a "GaAs FET" power supplies.
(Date Uncertain) Mitsubishi--nine sheets of product literature and preliminary specification of a Mitsubishi integrated bias circuit.

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