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SYSTEM AND METHOD FOR GENERATING AND RECEIVING TIME-ALIGNED MULTIPLE CHANNELS USING HIGH BANDWIDTH DATA CONVERTERS

IP.com Disclosure Number: IPCOM000170282D
Publication Date: 2008-May-14
Document File: 10 page(s) / 77K

Publishing Venue

The IP.com Prior Art Database

Abstract

This disclosure describes a system and method for generating and receiving time-aligned multiple Radio Frequency (RF) channels for communication systems using high bandwidth data converters.

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system and METHOD for generating and receiving time-aligned multiple channels using high bandwidth data converters

This disclosure describes a system and method for generating and receiving time-aligned multiple Radio Frequency (RF) channels for communication systems using high bandwidth data converters.

The system and method generates and receives multiple RF channels that are time-aligned using high bandwidth data converters. At the transmitter end of a communication system, a high bandwidth data converter, such as a high bandwidth Digital-to-Analog Converter (DAC), takes multiple channel digital inputs and converts them to multiple analog time-aligned channels at an intermediate frequency (IF). Further, the multiple time-aligned IF channels are up-converted and filtered to provide RF channels at the required frequencies and with the required time alignment. Similarly, at the receiver end of the communication system, the multiple analog time-aligned RF channels are filtered and down-converted to provide multiple analog time-aligned channels at an intermediate frequency (IF). The multiple IF channels are provided to a high bandwidth data converter, such as a high bandwidth Analog-to-Digital Converter (ADC), that converts the multiple IF channels to multiple channel digital outputs.

The system and method generate and receive multiple RF channels that are automatically time-aligned and hence, provides improved performance. Further, only a single data converter is required, which reduces circuit complexity.

Fig. 1 is a block diagram of a data converter based signal generator system 100 in which various examples of the system and method may be practiced. Signal generator system 100 includes a high bandwidth (BW) DAC 102, a mixer 104, and a band pass filter 106.

Signal generator system 100 generates multiple analog time-aligned RF channels. DAC 102 receives multiple channel digital inputs. The multiple channel digital inputs are received by DAC 102 as a combined digital signal. Further, DAC 102 converts the multiple channel digital inputs to multiple analog time-aligned channels at an intermediate frequency (IF). Mixer 104 up-converts the multiple time-aligned IF channels together to the required RF frequency. Mixer 104 performs the up-conversion by mixing the multiple time-aligned IF channels with a local oscillator input. Further, band pass filter 106 filters the up-converted multiple RF channels together. The filtered multiple time-aligned RF channels are output from signal generator system 100.  

In an example, output of DAC 102 contains two channels centered around an IF frequency of 200 MHz.

In an example, output of signal generator system 100 is centered around an RF frequency of 5 GHz.

In an example, sampling rate of DAC 102 is 2 Giga samples per second.

In an example, sampling rate of DAC 102 is high en...