Abstract: An amplifier for systems affected by changes in operating temperature, in which the amplifier gain is stabilized over temperature. A temperature compensating control element is added to the previously known active bias control amplifiers, forming a second control loop. This control acts to modify the device bias current, in a way which holds the device gain constant as temperature varies. In so doing it implements, in the circuit, the mathematically derived current variation which, based on the physics of the device, maintains constant gain. The additional circuitry is very inexpensive, preserving the cost-effectiveness of the integrated circuit bias scheme for those applications requiring the additional bias control.

Abstract: An amplifier for systems affected by changes in operating temperature, in which the amplifier gain is stabilized over temperature. A temperature compensating control element is added to the previously known active bias control amplifiers, forming a second control loop. This control acts to modify the device bias current, in a way which holds the device gain constant as temperature varies. In so doing it implements, in the circuit, the mathematically derived current variation which, based on the physics of the device, maintains constant gain. The additional circuitry is very inexpensive, preserving the cost-effectiveness of the integrated circuit bias scheme for those applications requiring the additional bias control.

Abstract: A voltage inverter provided as part of a low power amplifier system includes a charge pump capacitor, a charging inverter circuit for charging the charge pump capacitor in response to clock pulses, a FET grounding switch interposed between the charge pump capacitor and ground so that the charge pump capacitor can accumulate charge, an output storage capacitor for providing inverted voltage at the voltage inverter output, an output series switch interposed between the charge pump capacitor and the output storage capacitor for controlling charge transfer to the output storage capacitor; and a grounding switch driver circuit that includes a gate drive inverter, a gate drive pulldown coupled between the charge pump capacitor and the grounding switch so as to rapidly turn off the grounding switch at the outset of the charge transfer cycle, and a gate drive isolation switch interposed between the gate drive inverter output and the gate drive pulldown and responsive to the gate drive inverter output to prevent condu

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.