Patent ID: 6249187
Filing Date: 2001-06-19
Classification: H03F

Abstract:
A monolithic power amplifier circuit, comprising:a bias network formed in a semiconductor substrate and operable to receive a first supply voltage and to output a bias voltage signal;a transconductance amplifier circuit formed in the semiconductor substrate and operable to receive first and second supply voltages and an input voltage signal and to output an output current;a transimpedance amplifier circuit formed in the semiconductor substrate and operable to receive the first and second supply voltages, the bias voltage from the bias network and the output current signal from the transconductance amplifier circuit, the transimpedance amplifier circuit operable to output a output voltage signal sufficient in magnitude to drive a cathode of an electron gun of a video system; andthe transimpedance amplifier comprising a pull-up transistor coupled between the first supply voltage and the output voltage and a node operable to output the output voltage signal, the transimpedance amplifier circuit further comprising a pull-down transistor coupled between around potential and the output node, the transimpedance amplifier further comprising a plurality of current mirrors operable to communicate modulations in the current signal received from the transconductance amplifier circuit to the pull-up and pull-down transistors coupled to the output node;the transimpedance amplifier circuit further including:a first Wilson current mirror coupled between the first supply voltage and a node within the transimpedance amplifier circuit at which the bias voltage signal is received from the bias network; anda second Wilson current mirror coupled between the node at which the bias voltage signal is received from the bias network and ground potential;a first transfer current mirror coupled to the node at which the bias voltage signal is received, the node at which the current signal is received from the transconductor amplifier and the first Wilson current mirror; anda second transfer current mirror coupled to the node at which the bias voltage signal is received, the node at which the current signal is received from the transconductor amplifier circuit and the second Wilson current mirror.