# US 8,571,134 B2 · Polar transmitter

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- Number: US 8,571,134 B2
- Document ID: US8571134B2
- Status: Granted
- Kind: B2
- Application number: 13/062,330
- Filed: 2009-08-24
- Published: 2011-07-07
- Granted: 2013-10-29
- Earliest claimed: 2008-09-09
- Assignees: NXP B.V.
- Applicants: Nenad Pavlovic; Manel Collados; Xin He; Jan Van Sinderen
- Inventors: Nenad Pavlovic; Manel Collados; Xin He; Jan Van Sinderen
- Web page: https://patentgrep.com/patent/US8571134B2

## CPC

- H04L 27/361: {Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation}
- H04L 27/2627: {Modulators}
- H04L 2027/0018: {Arrangements at the transmitter end}
- H04L 2027/0067: {Phase error detectors}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

The present application relates to at least one digitally controlled oscillator and a data modulation device. More particularly, the digital polar transmitter comprises at least one digitally controlled oscillator configured to generate at least one frequency. The digital polar transmitter comprises a data modulation device, wherein the data modulation device comprises at least one data input terminal, at least one output terminal, and at least one frequency input terminal, wherein the output terminal is connected to the digitally controlled oscillator. The digital polar transmitter comprises a phase measuring device configured to measure phase information from the output signal of the data modulation device for every frequency sample. The digital polar transmitter comprises a phase error detecting device configured to detect a phase error at least depending on the measured phase information, wherein the phase error detecting device is configured to apply the detected phase error to the output signal of the data modulation device.

## Claims

### Claim 1

A digital polar transmitter, comprising:
at least one digitally controlled oscillator configured to generate at least one frequency,
a data modulation device,
wherein the data modulation device comprises at least one data input terminal, at least one output terminal, and at least one frequency input terminal,
wherein the output terminal is connected to the digitally controlled oscillator,
a phase measuring device configured to measure phase information from the output signal of the data modulation device for every frequency sample, and
a phase error detecting device configured to detect a phase error at least depending on the measured phase information,
wherein the phase error detecting device is configured to apply the detected phase error to the output signal of the data modulation device; and
a first quantizer device configured to generate a first control signal for controlling the digitally controlled oscillator.

### Claim 2 (depends on 1)

The digital polar transmitter according to claim 1, wherein the phase error detecting device is configured to calculate the phase error at least depending on the measured phase information of the output signal of the data modulation device and a sampling clock signal derived from the digitally controlled oscillator.

### Claim 3 (depends on 1)

The digital polar transmitter according to claim 1, wherein the phase error detecting device is configured to compensate the phase error by adding the detected phase error to the next frequency sample.

### Claim 4 (depends on 1)

The digital polar transmitter according to claim 1, wherein the data modulation device comprises at least one of:
a sampling rate converter, and
a transposed sampling rate converter.

### Claim 5 (depends on 1)

The digital polar transmitter according to claim 1, wherein the data modulation device comprises at least one interpolator device comprising at least one frequency input terminal.

### Claim 6 (depends on 1)

The digital polar transmitter according to claim 1, wherein the data modulation device comprises a cordic device configured to convert data from the IQ domain to the polar domain.

### Claim 7 (depends on 1)

The digital polar transmitter according to claim 1, further comprising a high speed accumulator configured to generate at least one frequency signal depending on the frequency generated by the digitally controlled oscillator.

### Claim 8 (depends on 1)

The digital polar transmitter according to claim 1, further comprising at least a second quantizer device configured to generate at least a second control signal for controlling the digitally controlled oscillator.

### Claim 9 (depends on 1)

The digital polar transmitter according to claim 1, wherein the phase measuring device is configured to detect a difference between two adjacent frequency samples.

### Claim 10 (depends on 1)

A wireless transmitter comprising the digital polar transmitter according to claim 1.

### Claim 11

A method, comprising:
supplying at least one frequency signal to a data modulation device,
processing at least one input data signal by the data modulation device,
supplying at least one output signal of the data modulation device to a digitally controlled oscillator,
Controlling the digitally controlled oscillator with a quantizer device configured to generate a control signal;
measuring the phase information of the output signal of the data modulation device by a phase measuring device every frequency sample,
detecting a phase error at least depending on the measured phase information, and
applying the detected phase error to the output signal of the data modulation device.

### Claim 12 (depends on 11)

A non-transitory computer readable medium having a computer program stored thereon, the computer program comprising instructions operable to cause a processor to perform a method according to claim 11.