Tunable oscillator using a reference input frequency

Details Tunable oscillator using a reference input frequency Tunable oscillator using a reference input frequency

1998-07-17

2000-01-18

Mis, David

Oscillators

Plural oscillators

Adjustable frequency

331 50, 331 54, 331 74, 331158, 331179, 331177V, 331186, 327172, H03B 500, H03B 532

Patent

active

060160810

ABSTRACT:
A tunable oscillator includes an input for receiving an input signal from a source of precision frequency such as a CMOS quartz crystal oscillator. The tunable oscillator converts the frequency of the input signal to a first current using a frequency to current converter. The current produced is proportional to a first capacitor, C1. The first current is replicated to produce a subsequent current using a current mirror structure. The subsequent current is then used to generate a periodic signal using a current to frequency converter. The output frequency of the current to frequency converter is inversely proportional to a second capacitor, C2. As such the output frequency of the tunable oscillator is tunable by changing the value of the capacitance ratio C1/C2. The invention is suitable for applications that require a precision tunable source of frequency such as automated test equipment (ATE) and electrical instrumentation.

REFERENCES:
patent: 4218661 (1980-08-01), Imamura

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