Power supply ripple rejection in tuner oscillator stage

Details Power supply ripple rejection in tuner oscillator stage Power supply ripple rejection in tuner oscillator stage

2006-06-27

2006-06-27

Mis, David (Department: 2817)

Oscillators

Frequency stabilization

C331S185000

Reexamination Certificate

active

07068117

ABSTRACT:
A bipolar transistor (Tr) in an oscillator stage of a tuner is provided with a diode (D10) in series with a resistor (R11) coupled between the base of the transistor (Tr) and the reference voltage to which the emitter of the transistor (Tr) is coupled. The diode (D10) allows a decreased resistor (R11) value which causes the supply voltage ripple (Vr1) on the collector originating from the base to decrease so as to better compensate the supply ripple (Vr2) on the collector directly originating from the supply voltage (Vs.).

REFERENCES:
patent: 3670264 (1972-06-01), Wakai
patent: 4032973 (1977-06-01), Haynes
patent: 4608544 (1986-08-01), Nordholt et al.
patent: 4751475 (1988-06-01), Kubo et al.
patent: 2602927 (1988-02-01), None

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