Hybrid filter bank analog/digital converter

Details Hybrid filter bank analog/digital converter Hybrid filter bank analog/digital converter

1994-10-20

1996-10-22

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

341144, 341155, H03M 100

Patent

active

055681425

ABSTRACT:
A hybrid filter bank analog-to-digital converter includes continuous-time analysis filters and discrete-time synthesis filters. The continuous-time analysis filters partition a continuous-time wideband input signal into continuous-time subband signals. An analog-to-digital converter bank quantizes the subband signals at a low data rate. A bank of upsamplers increases the data rate of the quantized subband signals. A bank of discrete-time synthesis filters processes the upsampled subband signals, generating signals which are the discrete-time approximation of the continuous-time subband signals. The subband signals may be recombined into a discrete-time wideband signal which is the discrete-time approximation of the continuous-time wideband input signal. The linearity errors, analog-to-digital converter mismatches and quantization noise are not compounded between the frequency bands, thereby increasing resolution. The system may also include compensators for compensating for non-linear behavior in the analog-to-digital converters and may include application-specific processors for further processing of the compensated subband signals. An alternative embodiment employs discrete-time analysis filters and continuous-time synthesis filters for digital-to-analog conversion.

REFERENCES:
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patent: 5465072 (1995-11-01), Atarodi
A. Petraglia, et al., "Design of Magnitude Preserving Analog-to-Digital Converter," IEICE Trans. Fundamentals, E76-A(2):149-155 (Feb. 1993).
A. Petraglia, et al., "High-Speed A/D Conversion Incorporating a QMF Bank," IEEE Trans. on Instrumentation and Measurement, 41(3):427-431 (Jun. 1992).
A. Petraglia, et al., "QMF-Based A/D Converters:Overview and New Results," Proc. Int. Conf. on Analogue to Digital and Digital to Analogue Conversion, University College of Swansea, UK, pp. 112-117, (Sep. 1991).
A. Petraglia, et al., "High Speed AD Conversion Using QMF Banks," Proceedings of IEEE International Symposium on Circuits and Systems (1990).
S. R. Velazquez, et al., "A Hybrid Filter Bank Approach to Analog-to-Digital Conversion," IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis (Oct. 25-28, 1994) Philadelphia, PA .

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