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1. (WO2010121644) AN IMPROVED OSCILLATOR CIRCUIT

Pub. No.:    WO/2010/121644    International Application No.:    PCT/EP2009/054668
Publication Date: Fri Oct 29 01:59:59 CEST 2010 International Filing Date: Tue Apr 21 01:59:59 CEST 2009
IPC: H03B 5/18
Applicants: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
BAO, Mingquan
Inventors: BAO, Mingquan
Title: AN IMPROVED OSCILLATOR CIRCUIT
Abstract:
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.