Fully differential high gain cascode amplifier

Amplifiers – With semiconductor amplifying device – Including differential amplifier

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Details

330261, H03F 345

Patent

active

057480400

ABSTRACT:
A very high gain cascode amplifier includes a cascoded differential structure wherein a cascoded N-channel leg comprised of two series connected transistors (56) and (58) are connected between an output node (30) and ground with a corresponding P-channel cascode leg comprised of series connected P-channel transistors (38) and (40) connected between node (30) and V.sub.DD. Transistor (58) is connected to bias voltage, with transistor (56) having a gate thereof connected to a bias circuit (72) which provides gain thereto to increase the gain of a cascoded leg while not introducing any error into the amplifier. The bias circuit (72) has an imbedded structure that sets the gate voltage of transistor (56) to a voltage equal to one threshold voltage plus twice the V.sub.on voltage of transistors (56) and (58). This is achieved via negative feedback with transistors that track any errors, such that all errors are cancelled out and the maximum voltage swing is maintained for all operational characteristics of the cascoded leg.

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