# US 9,438,290 B2 · Receiver having a calibration source

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- Number: US 9,438,290 B2
- Document ID: US9438290B2
- Status: Granted
- Kind: B2
- Application number: 13/244,587
- Filed: 2011-09-25
- Published: 2013-03-28
- Granted: 2016-09-06
- Earliest claimed: 2011-09-25
- Assignees: Silicon Laboratories Inc.
- Applicants: Hendricus De Ruijter; Tamas Marozsak; Peter Onody
- Inventors: Hendricus De Ruijter; Tamas Marozsak; Peter Onody
- Web page: https://patentgrep.com/patent/US9438290B2

## CPC

- H04B 1/28: the receiver comprising at least one semiconductor device having three or more electrodes
- H04B: TRANSMISSION

## Abstract

An RF receiver includes an RF signal reception path to process an input signal for the receiver for a first mode of the receiver; an oscillator; and a harmonic generator. The harmonic generator generates a harmonic signal in response to operation of the oscillator to replace the input signal with the harmonic signal for a second mode of the receiver.

## Claims

### Claim 1

A method comprising:
using a signal reception path in a radio frequency (RF) receiver to process an input signal for the receiver for a first mode of the receiver;
using a harmonic generator of the receiver to generate a harmonic signal; and
using the harmonic signal to replace the input signal with the harmonic signal for a second mode of the receiver, wherein the act of using the harmonic generator comprises using a square wave generator or a pulse generator.

### Claim 2 (depends on 1)

The method of claim 1, wherein the using comprises using the harmonic signal during a calibration mode to calibrate an image rejection of the receiver.

### Claim 3 (depends on 1)

The method of claim 1, further comprising performing at least one of the following using a response of the receiver to the harmonic signal:
a self-test of the receiver, a received signal strength indicator (RSSI) calibration and an image calibration.

### Claim 4 (depends on 1)

The method of claim 1, further comprising isolating the receive path from an antenna of the receiver for the second mode and coupling the receive path to the antenna for the first mode.

### Claim 5 (depends on 1)

The method of claim 1, further comprising providing a signal from a reference oscillator of the receiver to the harmonic generator and tuning a local oscillation frequency of the receiver based on the harmonic.

### Claim 6 (depends on 5)

The method of claim 5, wherein the tuning comprises tuning the local oscillation frequency to a combination of a frequency of the harmonic and an intermediate frequency.

### Claim 7 (depends on 1)

The method of claim 1, further comprising coupling the harmonic generator to the receive path using a coupling network.

### Claim 8

A radio frequency (RF) receiver comprising:
an RF signal reception path to process an input signal for the receiver for a first mode of the receiver;
an oscillator; and
a harmonic generator to generate a harmonic signal in response to operation of the oscillator to replace the input signal with the harmonic signal for a second mode of the receiver wherein the harmonic generator comprises a square wave generator or a pulse generator.

### Claim 9 (depends on 8)

The receiver of claim 8, wherein the harmonic generator is adapted to generate the harmonic signal in response to a calibration mode or a self-test mode of the receiver.

### Claim 10 (depends on 8)

The receiver of claim 8, further comprising a switch to selectively isolate the antenna from the signal reception path for the second mode and couple the antenna to the signal reception path for the first mode.

### Claim 11 (depends on 8)

The receiver of claim 8, further comprising a mixer and a locked loop adapted to furnish a mixing signal to the mixer in response to the operation of the oscillator.

### Claim 12 (depends on 11)

The receiver of claim 11, wherein the locked loop is adapted to be tuned to a frequency based on a frequency of the harmonic and an intermediate frequency (IF).

### Claim 13 (depends on 8)

The receiver of claim 8, further comprising a phase locked loop to provide at least one mixing signal for the receiver in response to a signal provided by the oscillator.

### Claim 14

An apparatus comprising:
an integrated circuit comprising a radio frequency (RF) signal reception path; an oscillator; and a harmonic generator,
wherein the harmonic generator is adapted to generate a harmonic signal during a calibration mode of an RF receiver to calibrate an image rejection of the receiver wherein the harmonic generator comprises a square wave generator or a pulse generator.

### Claim 15 (depends on 14)

The apparatus of claim 14, further comprising a switch to selectively isolate an antenna of the receiver from the signal reception path in the calibration mode.

### Claim 16 (depends on 14)

The apparatus of claim 14, further comprising a mixer and a locked loop adapted to furnish a mixing signal to the mixer in response to the operation of the oscillator.

### Claim 17 (depends on 14)

The apparatus of claim 14, wherein the mixer comprises an image rejection mixer.