CMOS differential amplifier for a delta sigma modulator applicab

Details CMOS differential amplifier for a delta sigma modulator applicab CMOS differential amplifier for a delta sigma modulator applicab

1998-04-27

2000-01-25

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327323, 327563, 330252, 330293, H03K 508

Patent

active

060182628

ABSTRACT:
An analog-digital converter includes a .DELTA..SIGMA. modulator, a digital filter, a high-pass filter and a multiplier which are connected in series. Analog input is converted into serial-bit strings by the .DELTA..SIGMA. modulator, for which gain `1/A` is set. The digital filter extracts low-frequency components, corresponding to the analog input, from the serial-bit strings, so the low-frequency components are converted into parallel-bit digital data. The high-pass filter removes DC offset component from output of the digital filter; and then, output thereof is multiplied by scaling gain `A` by the multiplier so that digital output is produced. The .DELTA..SIGMA. modulator includes at least three switched-capacitor integrators and a one-bit quantizer, which are connected in series, as well as a one-sample delay circuit. One-bit output, produced by the one-bit quantizer, is delayed by the one-sample delay circuit, whose output is delivered to each switched-capacitor integrator. Each switched-capacitor integrator is configured using a CMOS differential amplifier which is configured by a CMOS operational amplifier and at least one amplitude-limiting circuit. The amplitude-limiting circuit is configured by two PMOS transistors and two NMOS transistors which are connected in parallel in a diode-connection manner; and this circuit is provided to limit amplitude in output of the CMOS differential amplifier by stabilizing its operating point.

REFERENCES:
patent: 3558917 (1971-01-01), Crouse
patent: 4323798 (1982-04-01), Watkins
patent: 4445053 (1984-04-01), Jaeger et al.
patent: 4547741 (1985-10-01), Katakura
patent: 4849708 (1989-07-01), Brehmer et al.
patent: 4851841 (1989-07-01), Sooch
patent: 5187482 (1993-02-01), Tiemann et al.
patent: 5757299 (1998-05-01), Noro et al.
S. Moussavi, et al., IEEE Transactions on Circuits and Systems-II: Analog and Digital Signal Processing, "High-Order Single-Stage Single-Bit Oversampling A/D Converter Stabilized With Local Feedback Loops", vol. 41, No. 1, Jan. 1994.

Affiliated with

Also associated with

Rating

CMOS differential amplifier for a delta sigma modulator applicab does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with CMOS differential amplifier for a delta sigma modulator applicab, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and CMOS differential amplifier for a delta sigma modulator applicab will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2318241