The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 1996
Filed:
Oct. 20, 1994
Scott R Velazquez, Somerville, MA (US);
Truong O Nguyen, Madison, WI (US);
Steven R Broadstone, Woburn, MA (US);
Massachusetts Institute of Technology, Cambridge, MA (US);
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.