US 2014/0152394 A1 · FREQUENCY DETECTION CIRCUITS, RADIO FREQUENCY SIGNAL PROCESSING DEVICES AND METHODS FOR CALIBRATING INDUCTANCE AND CAPACITANCE

Abstract

A frequency detection circuit includes a filter, a power detector and a voltage comparator. The filter receives and filters a converted signal to generate a filtered signal. The power of the filtered signal relates to a frequency of the converted signal. The power detector generates a voltage according to the power of the filtered signal. The voltage comparator compares the voltage with multiple reference voltages to generate multiple comparison results. At least one of the inductance and capacitance of an LC tank in an amplifier is adjusted according to the comparison results.

Claims15

Dependent claims

A frequency detection circuit, comprising:

a filter, receiving and filtering a converted signal to generate a filtered signal, wherein a power of the filtered signal relates to a frequency of the converted signal;
a power detector, coupled to the filter for generating a voltage according to the power of the filtered signal;
and
a voltage comparator, comparing the voltage with a plurality of reference voltages to generate a plurality of comparison results,
wherein at least one of an inductance and a capacitance of an LC tank in an amplifier is adjusted according to the comparison results.

2 more elements

A radio frequency signal processing device, comprising:

a low-noise amplifier, comprising:
an LC tank;
an amplifier circuit, coupled to the LC tank at a pair of differential output terminals;
a cross-coupled transistor pair, couple to the LC tank at the pair of differential output terminals;
and
a current source, coupled to the cross-coupled transistor pair,
wherein the cross-coupled transistor pair, the LC tank and the current source form a self-oscillation circuit for generating an oscillating signal oscillating at an oscillating frequency according to an inductance and a capacitance of the LC tank;
a mixer, down-converting the oscillating signal according to a desired frequency to generate a converted signal;
and
a frequency detection circuit, coupled to the low-noise amplifier and the mixer for detecting a frequency of the converted signal and generating a calibration signal according to the frequency,
wherein at least one of the inductance and the capacitance of the LC tank is adjusted according to the calibration signal.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application

14/017,391Filed 4 Sep 2013

Priority

CN 201210512819.74 Dec 2012

Published

5 Jun 2014

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

G01R 35/005
Testing or calibrating of apparatus covered by the other groups of this subclass: calibrating; Standards or reference devices, e.g. voltage or…
G01R 35/00
Testing or calibrating of apparatus covered by the other groups of this
G01R 31/2822
Testing of electronic circuits specially adapted for particular applications not provided for elsewhere: of microwave or radiofrequency circuits
G01R 31/64
Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections: testing…

Frequency detection circuits, radio frequency signal processing devices and methods for calibrating inductance and capacitance

Life of this patent

Frequency detection circuits, radio frequency signal processing devices and methods for calibrating inductance and capacitance

Life of this patent

Abstract

Claims15