| 摘要 |
A detector circuit for a color television receiver includes a pair of transistors whose collector-emitter circuits are connected in parallel with each other, an input circuit, such as a differential amplifier, for supplying a differential input signal to the base electrodes of the pair of transistors, an impedance element coupled between the collector electrodes of the pair of transistors and a voltage source, and an integration circuit for integrating a detected signal taken from the collector electrodes of the pair of transistors and thereby providing an output signal. A reference-voltage circuit is included to supply a reference voltage, which can be used as a threshold voltage, to the emitter electrodes of the pair of transistors. The detector circuit is advantageously used in the color demodulating circuit of a color television receiver, wherein an oscillator controlled by color burst signals supplies the input signal to the detector circuit, and the output thereof is used to control the gain of an ACC amplifier. |
