Buffered transconductance amplifier

Amplifiers – With semiconductor amplifying device – Including push-pull amplifier

Patent

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Details

330257, 330267, H03F 330

Patent

active

051031884

ABSTRACT:
An electrical circuit for amplifying complex, wideband signals, preferably audio and servo/robotic signals, comprises a first input buffer in an emitter-follower configuration or in a source-follower configuration. A bias current rail traverses the first buffer. The low impedance output of the first buffer is connected to a load resistor, preferably in the order of 50-500 ohms. The circuit further comprises positive and negative opposing current mirrors connected to the bias current rail that reflect the currents created in the bias current rail by an input voltage signal imposed across the load resister. The combined outputs of the current mirrors are connected to the input of a second buffer. The output of the second buffer is connected via a feedback means to the output of the first buffer and to a load. The first buffer is driven by dual voltage supply rails, preferably a lower voltage, in the order of 15 Volts. Higher dual voltage supply rails for the second buffer and the opposing current mirrors, typically at least 50 to 70 Volts, are used for power amplifiers. The present invention provides an amplifier which can amplify complex, high speed, wideband signals without slew rate, overshoot, or ringing and still maintain a large degree of linearity with increasing input overdrive. It is capable of unprecedented high frequency response and phase stability without any need for typical compensation techniques.

REFERENCES:
patent: 4555672 (1985-11-01), Segal

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