Oscillator circuit

摘要

An oscillator circuit (100, 200, 300, 10, 11) comprising a resonator (105) connected serially with a series to series feedback amplifier (110, 92), in which the series to series amplifier comprises a feedback network (210, 91) which has an impedance value which is below a certain first predefined limit and a phase value which increases with the operational frequency of the oscillator circuit with a rate which is above a second predefined limit. In one embodiment, the impedance value of the feedback network (210, 91) also varies with the operational frequency of the oscillator circuit, but is always below said first predefined value within the operational frequency of the oscillator circuit.

主权项

1. An oscillator circuit, comprising;
a resonator connected in parallel to a first and a second port of a feedback amplifier, with a third and a fourth port of the feedback amplifier being connectable to ground, wherein the feedback amplifier comprises:
at least one amplifier element comprising the first, second, and third ports, anda feedback network comprising the fourth port and being connected to the amplifier element via the third port, the third and fourth ports being physically decoupled from the first port, wherein the feedback network has an absolute impedance value that is below a certain first predefined limit and a phase value that increases with the operational frequency of the oscillator circuit with a rate that is above a second predefined limit, and wherein the resonator has a fixed oscillation frequency and the feedback network has a resonance frequency which is essentially equal to the oscillation frequency of the resonator.