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US 7,606,321 B2Granted
System and method for simplifying analog processing in a transmitter incorporating a randomization circuit
AssigneeBroadcom Corporation
InventorMeng-An Pan
Life of this patent
Estimating the term…
Abstract
The system and method enable simpler analog processing in a transmitter by reducing the number of bits in a digital signal through delta sigma modulation. Selection of current sources in a digital to analog converter of the transmitter is done using a randomization circuit.
Claims13
A method, comprising:
- performing interpolation filtering on a digital quadrature signal, wherein the interpolation filtering reduces the digital quadrature signal from 12 bits to 10 bits;
- performing delta sigma modulation on the interpolated digital quadrature signal;
- coding the modulated signal with a thermometer code;
- converting the coded signal to an analog signal using randomly selected current sources of a Digital to Analog Converter;
- converting the analog signal to an RF signal;
- and
- transmitting the RF signal.
4 more elements
A system, comprising:
- means for performing interpolation filtering on a digital quadrature signal, wherein the interpolation filtering reduces the digital quadrature signal from 12 bits to 10 bits;
- means for performing delta sigma modulation on the interpolated digital quadrature signal;
- means for coding the modulated signal with a thermometer code;
- means for converting the coded signal to an analog signal using randomly selected current sources of a Digital to Analog Converter;
- means for converting the analog signal to an RF signal;
- and
- means for transmitting the RF signal.
4 more elements
An RF transmitter, comprising:
- an interpolation filter configured to perform interpolation filtering on a digital quadrature signal, wherein the interpolation filtering reduces the digital quadrature signal from 12 bits to 10 bits;
- a delta sigma modulator configured to perform delta sigma modulation on the interpolated digital quadrature signal and configured to code the modulated signal with a thermometer code;
- a DAC, communicatively coupled to the delta sigma modulator, configured to convert the coded signal to an analog signal using randomly selected current sources;
- a mixer, communicatively coupled to the DAC, configured to convert the analog signal to an RF signal;
- and
- an antenna, communicatively coupled to the mixer, configured to transmit the RF signal.
3 more elements
Dependencies are inferred from the claim text.