An integrated 150-V/sub pp/, 12-V/ns, class-AB CRT-driving amplifier

An integrated output amplifier is presented with an output-voltage swing of more than 150 V/sub pp/, a slew rate of 12 V/ns, a large-signal bandwidth of 30 MHz, and a small-signal bandwidth exceeding 60 MHz. The amplifier is intended to drive the cathode ray tube (CRT) in a projection television or a high-definition television (HDTV) set. The amplifier comprises a transadmittance stage followed by a feedback transimpedance amplifier. Application of a zero in the feedback transfer function allows the open-loop voltage gain of the transimpedance amplifier to have a -12-dB/octave slope at the unity-loop-gain frequency. A zero in the transfer function of the transadmittance stage results in a larger overall bandwidth than is possible in a conventional voltage-feedback configuration.<
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