US 2011/0032043 A1 · RESONANT OSCILLATOR CIRCUIT WITH REDUCED STARTUP TRANSIENTS

Abstract

Some embodiments of the present invention provide a system that implements a resonant oscillator circuit. This resonant oscillator circuit includes: a first inductor, a second inductor, a first capacitance, and a second capacitance, wherein the first and second inductors are configured to operate with the first and second capacitances to produce resonant oscillations which appear at a first phase output and a second phase output. The system also includes a startup circuit which is configured to start the resonant oscillator circuit in a state where: the first phase output is at a peak voltage; the second phase output is at a base voltage; and currents through the first and second inductors are substantially zero. By starting the resonant oscillator circuit in this state, the oscillations commence without a significant startup transient.

Claims23

Dependent claims

A resonant oscillator circuit, comprising:

a first inductor;
a second inductor;
a first capacitance;
a second capacitance;
wherein the first and second inductors are configured to operate with the first and second capacitances to produce resonant oscillations which appear at a first phase output and a second phase output;
and
a startup circuit configured to start the resonant oscillator circuit in a state where the first phase output is at a peak voltage, the second phase output is at a base voltage, and currents through the first and second inductors are substantially zero, so that oscillations commence without a significant startup transient.

4 more elements

A method for starting up a resonant oscillator circuit, wherein the resonant oscillator circuit includes a first inductor, a second inductor, a first capacitance, and a second capacitance, wherein the first and second inductors are configured to operate with the first and second capacitances to produce resonant oscillations which appear at a first phase output and a second phase output, the method comprising:

performing one or more initialization operations so that the resonant oscillator circuit is in an initial state where the first phase output is at a peak voltage, the second phase output is at a base voltage, and currents through the first and second inductors are substantially zero;
and
allowing the resonant oscillator circuit to commence oscillations from the initial state without a significant startup transient.

A resonant oscillator circuit, comprising:

a first inductor with a constant potential terminal coupled to an input voltage and a time-varying potential terminal coupled to a first phase output;
a second inductor with a constant potential terminal coupled to the input voltage and a time-varying potential terminal coupled to a second phase output;
a first n-type transistor with a source terminal coupled to a base voltage, a drain terminal coupled to the first phase output, and a gate terminal coupled to the second phase output;
a second n-type transistor with a source terminal coupled to the base voltage, a drain terminal coupled to the second phase output, and a gate terminal coupled to the first phase output;
a first capacitance, which includes capacitive components from a load on the first phase output and the gate terminal of the second n-type transistor;
a second capacitance, which includes capacitive components from a load on the second phase output and the gate terminal of the first n-type transistor;
and
a startup circuit configured to start the resonant oscillator circuit in a state where the first phase output is at a peak voltage, the second phase output is at a base voltage, and currents through the first and second inductors are substantially zero, so that oscillations commence without a significant startup transient.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

12/629,370Filed 2 Dec 2009

Priority

5 Aug 2009

Published

10 Feb 2011

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

H02M 3/07
Using resistors or capacitors, e.g. potential divider: using capacitors charged and discharged alternately by semiconductor devices with control…
H03B 5/06
Details: modifications of generator to ensure starting of oscillations
H03B 5/1212
Using multiple transistors for amplification: the amplifier comprising a pair of transistors, wherein an output terminal of each being connected…
H03B 5/1228
Active element in amplifier being semiconductor device: the amplifier comprising one or more field effect transistors

Family

Application12/535,974Continuation in part · filed 5 Aug 2009

Application12/540,578Continuation in part · filed 13 Aug 2009

Application12/629,370Continuation in part

US 2011/0031956 A1Published application

US 2011/0032042 A1Published application

US 7,982,548 B2Related patent

US 8,085,103 B2Related patent

US 8,320,141 B2Related patent

US 2011/0032043 A1This patent

From the US filing history. Foreign family members aren’t listed.

Resonant oscillator circuit with reduced startup transients

Life of this patent

Resonant oscillator circuit with reduced startup transients

Life of this patent

Abstract

Claims23