Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1997-02-26
1998-10-20
Hoang, Huang
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 18, 331 25, 331 43, H03L 700
Patent
active
058252525
ABSTRACT:
A synthesized oscillation circuit that can relax a limitation of the maximum operational frequency. A mixer (MX), a bandpass filter (BPF), an amplitude limiting amplifier (LIM), a phase detector (PD), a low-pass filter (LPF), and a voltage-controlled oscillator (VCO) are serially connected between a signal input terminal (IN) and a signal output terminal (OUT). The signal output terminal (OUT) is connected the mixer (MX) and the phase detector (PD). The bandpass filter (BPF) has a filtering characteristic which blocks the sum frequency component of the frequency component of an input signal from the signal input terminal (IN) to the mixer (MX) and the frequency component of an output signal from the voltage-controlled oscillator (VCO) to the mixer (MX), but which passes the difference frequency component between them. The low-pass filter (LPF) has a filtering characteristic which blocks the sum frequency component of the frequency component of a signal from the voltage-controlled oscillator (VCO) to the phase detector (PD) and the frequency component of a signal from the voltage-controlled oscillator (VCO) to the phase detector (PD), but which passes the difference frequency signal between them.
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patent: 5654574 (1997-08-01), Matsuto
patent: 5661439 (1997-08-01), Watkins et al.
Hoang Huang
OKI Electric Industry Co., Ltd.
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