Buffer amplifier circuit used in wideband tuner

Details Buffer amplifier circuit used in wideband tuner Buffer amplifier circuit used in wideband tuner

H - Electricity

04

B

325/115, 350/94

H04B 1/28 (2006.01) H03F 3/191 (2006.01)

Patent

CA 1149878

ABSTRACT OF THE DISCLOSURE A buffer amplifier circuit of a wideband tuner has an output transistor. The output terminal of this transistor is grounded through a matching transformer having two taps. One of the taps constitutes a terminal through which the output signal is delivered to a mixer circuit, while the other tap is grounded through a capacitor which constitutes, in cooperation with the matching transformer, a trap circuit. This trap circuit is adapted to trap a frequency which is about twice as high as the low region oscillation frequency of a local oscillator which pro- duces an input to the buffer amplifier circuit.

359029

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