Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1997-12-09
1999-12-21
Tokar, Michael
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
375322, H03M 300, H03D 300, H03K 906
Patent
active
060055065
ABSTRACT:
A receiver comprising a sigma-delta analog-to-digital converter (.SIGMA..DELTA. ADC) can be utilized in one of four configurations, as a subsampling bandpass receiver, a subsampling baseband receiver, a Nyquist sampling bandpass receiver, or a Nyquist sampling baseband receiver. For subsampling .SIGMA..DELTA. receivers, the sampling frequency is less than twice the center frequency of the input signal into the .SIGMA..DELTA. ADC. For Nyquist sampling .SIGMA..DELTA. receivers, the sampling frequency is at least twice the highest frequency of the input signal into the .SIGMA..DELTA. ADC. For baseband .SIGMA..DELTA. receivers, the center frequency of the output signal from the .SIGMA..DELTA. ADC is approximately zero or DC. For bandpass .SIGMA..DELTA. receivers, the center frequency of the output signal from the .SIGMA..DELTA. ADC is greater than zero. The sampling frequency can be selected based on the bandwidth of the input signal to simplify the design of the digital circuits used to process the output samples from the .SIGMA..DELTA. ADC. Furthermore, the center frequency of the input signal can be selected based on the sampling frequency and the bandwidth of the input signal. The .SIGMA..DELTA. ADC within the receiver provides many benefits.
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Bazarjani Seyfollah S.
Butterfield Daniel K.
Ciccarelli Steven C.
Younis Saed G.
Edmonston Brian S.
English Sean
Miller Russell B.
Qualcomm Incorporated
Tokar Michael
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