GATEWAY 3250 CONEXANT MODEM DRIVER DETAILS:
|File Size:||18.2 MB|
|Supported systems:||ALL Windows 32x/64x|
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GATEWAY 3250 CONEXANT MODEM DRIVER
The tuner is one embodiment of the analog tuner Gateway 3250 Conexant Modem can be used in integrated set-top box The tuner includes a direct down conversion circuitan analog-to-digital converter ADCa demodulation circuita memoryan IQ Error Detection circuitand a local oscillator circuit The direct down-conversion circuit includes quadrature mixers a and b, and lowpass filters a and b. The local oscillator circuit includes: A low noise amplifier may be included off-chip, on a separate substrate.
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During operation, the direct down conversion circuit receives the RF input signal The RF input signal is optionally amplified by Gateway 3250 Conexant Modem low-noise amplifier For instance, a discrete low-noise amplifier, such as Broadcom part number BCMcan be coupled to the input of the quadrature direct down conversion circuit In an alternate embodiment, the amplifier is integrated on-chip with the quadrature direct down-conversion circuit The mixers a and b mix the RF input signal and a quadrature local oscillator signal to provide a down-converted signal. More specifically, mixer a mixes the RF input signal and a first quadrature component a of the local oscillator signal to provide a Gateway 3250 Conexant Modem down-converted quadrature component a. Mixer b mixes the RF input signal and a second quadrature component b of the local oscillator signal to provide a second down-converted quadrature component b.
The first and Gateway 3250 Conexant Modem quadrature components a and b can be at baseband or a low frequency IF depending on the operating frequency of the local oscillator. One or more low pass filters LPFs can be included to reduce or eliminate unwanted signal energy. A multiplexer selects the first down-converted quadrature Gateway 3250 Conexant Modem a or the second down-converted quadrature component b to be sent to the analog-to-digital converter ADC The receiver includes a single ADC for illustrative purposes, though the scope of the present invention is not limited in this respect.
Separate ADCs could be used for the quadrature channels. The multiplexer interleaves samples of the first down-converted quadrature component a and the second down-converted quadrature component b to provide an interleaved sample of the down-converted Gateway 3250 Conexant Modem components to the ADC In one embodiment, the multiplexer toggles at a rate equal to at least twice the effective sampling rate of the ADCso that both quadrature components can be adequately sampled. For example, sampling at this rate can facilitate accurate conversion of the down-converted quadrature components a and b by the ADC The ADC converts the interleaved sampling of the down-converted quadrature components into a digital signal.
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According to an embodiment, the sampling rate of the ADC equals the interleaving rate of the multiplexer plus Gateway 3250 Conexant Modem over sampling ratio. A demultiplexer de-interleaves the digital samples of the down-converted quadrature components provided by the ADC to provide quadrature digital signals a and b.
In an embodiment, the de-multiplexer toggles at a rate equal to the toggle rate of the multiplexer The demodulation circuit receives quadrature digital Gateway 3250 Conexant Modem a and b and provides a demodulated signal In an embodiment, the demodulation circuit is a quadrature amplitude modulation QAM demodulation circuit. For example, the demodulation circuit can include a Nyquist filter, a variable Gateway 3250 Conexant Modem symbol demodulator, an equalizer, and a carrier recovery loop all not shown for convenience. The IQ error detection circuit can also include a carrier tracking loop that determines any frequency error in the down-converted signals a and b, which can then be corrected by the local oscillator circuit The IQ error detection circuit forwards the IQ error to a summerwhich also receives a desired frequency for down-conversion.
The desired frequency Gateway 3250 Conexant Modem the desired frequency or channel that is to be selected from the RF input signal The local oscillator circuit then sets the frequency of the local oscillator signal based on the selected channel of the RF input signal The local oscillator circuit also adjusts quadrature LO components a and b so as to correct any IQ amplitude or phase errors, as discussed further below. The local oscillator circuit includes a Direct Digital Frequency Synthesizer DDFS and a memory to generate a digital representation of the local oscillator signal. The memory stores Gateway 3250 Conexant Modem read-only memory ROM lookup table.
The ROM lookup table includes a plurality of entries, where each entry represents a phase of the local oscillator signal or a sine or cosine thereof. File name: File size: MB Version: latest Downloads today: Downloads. Acer Conexant-Askey HCF V90 56K PCI Gateway 3250 Conexant Modem Gateway Conexant Modem Driver version: · Gateway Digitizer.
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