Tuning circuit for a receiver, particularly a television receive

Details Tuning circuit for a receiver, particularly a television receive Tuning circuit for a receiver, particularly a television receive

1996-02-01

1999-01-12

Flynn, Nathan J.

Television

Receiver circuitry

Tuning

348733, H04N 544

Patent

active

058596747

ABSTRACT:
Tuning circuit in which a local oscillator is constituted by an amplifier which is coupled to a resonant circuit of the variable capacitance and inductance type, the amplifier having a first stage formed by at least one differential pair of bipolar transistors (T1, T2). The amplifier has also a second stage with another differential pair of transistors whose linked emitters are fed by the collector current of one (T2) of the transistors of the first stage. A transistor (T3) of the differential pair of the second stage has its collector coupled to a main load resistor (RL) and its base coupled to the collector of the other transistor (T1) of the first stage, which feeds a supplementary load resistor (Rb). The base of the other transistor (T4) of the differential pair of the second stage may be polarized at a fixed voltage (Vref2) or at a variable voltage, having the appropriate.

REFERENCES:
patent: 4926137 (1990-05-01), Shogaki et al.
patent: 5034706 (1991-07-01), Betti et al.
patent: 5198781 (1993-03-01), Kusakabe
patent: 5198784 (1993-03-01), Fenk

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