Single-sideband quadrature modulation is used in a fourth-order bandpass SD modulator requiring only two op amps that integrate in both clock phases. The modulator samples at 2MHz, occupies 1mm2 in 2mm CMOS, consumes 2mW from 3.3V, and provides 50dB SNR in 100kHz bandwidth.

12.2 A 22kHz Multi-Bit Switched-Capacitor SD D/A Converter with 92dB Dynamic Range (2:00)

A five-level switched-capacitor D/A converter with a multi-bit SD modulator uses sub-interval clocking to reduce distortion caused by capacitor mismatch. The modulator achieves 92dB dynamic range and THD less than -94dB over a 22kHz bandwidth, and consumes 155mW in 2mm CMOS.

12.3 A Two-Channel 16/18b Audio A/D-D/A Including Filter Functions with 60/40mW Power Consumption at 2.7V (2:30)

A stereo codec has 90dB SNDR, and A/D and D/A dynamic ranges of 96dBA and 105dBA. The A/D converters employ a third-order modulator to relax opamp speed and output-swing requirements. The D/A converters use second-order modulators with 5b continuous current calibration DACs. The 28mm2 chip is in low-VT 0.8mm CMOS.

Break (3:00)

12.4 A 20MSample/s Switched-Capacitor Finite-Impulse-Response Filter in 2mm CMOS (3:15)

Power dissipation is reduced in a programmable four-tap analog FIR filter using a modified transposed architecture and double-sampling integrators. The structure allows reduction in total array capacitance without compromising coefficient resolution. The fully-differential filter occupies 11.8mm2 and dissipates 45mW from 5V.

12.5 A 150MSample/s 20mW BiCMOS Switched-Capacitor Biquad Using Precise-Gain Opamps (3:45)

Wideband amplifiers with low controlled voltage gains permit filter synthesis techniques to compensate for gain errors in an SC biquad. With Q=2.8, 0.2dB passband accuracy is achieved at 150MSample/s. Implemented in 1.2mm BiCMOS, the 1mm2 chip achieves 67dB dynamic range with less than -60dB THD for a 1.5Vpp 5MHz input signal.

12.6 60MHz Self-Tuned Continuous-Time Filter for Mass-Storage Applications (4:15)

Self-tuning of frequency response and Q-factor in a continuous-time filter are achieved by applying the main signal in differential-mode form and the reference signal in common-mode. A second-order filter in a 9GHz bipolar process has adjustable 12-60MHz cutoff frequency and dissipates 85mW from 5V.

Conclusion (4:45)

Go back to the SSCS page

Go back to the ISSCC page

If you have any comments for the ISSCC, please forward them to

Comments related to the maintenance of this web site should be sent to sscs@eecg.toronto.edu .