,4mtract — MOS technology scaling requires the use of lower supply voltages. Analog circuits operating from a low supply and achieving a sufficiently farge dynamic range must be designed if analogidigital inter-faces are to be implemented in scaled technologies. This paper describes a high-performance fifth-order low-pass switched-capacitor filter operating from a single 5-V supply. The filter uses a fully differential topology combined with input-to-output class A B amplifier design, dynamic biasing, and switched-capacitor common-mode feedback (CMFB). An experimental prototype fabricated in a 5- p m CMOS technology requires orlly 350 pW of power to meet the PCM channel filter requirements. Typical measured results are a dynamic range of 92 dB, a supply rejection (PSRR) of 40 dB over the entire Nyquist range, and a total harmonic distortion (THD) of – 73 dB for a 2-V rms dlfferentiaf output signal. The chip active area is about 3900 milz.

In low power current mode signal processing circuits it is many times required to use current mirrors to replicate and amplify/attenuate current signals, and to clamp the voltage of nodes with high parasitic capacitances so that the smallest currents do not introduce unacceptable delays. The use of tunable active-input current mirrors would meet both requirements. In conventional active input current mirrors stability compensation is required. Furthermore, once stabilized, input current cannot be made arbitrarily small. In this paper we introduce two new active-input current mirrors that clamp their input node to a given voltage. One of them does not require compensation, while the other may require under some circumstances, but for both input current may take any value. The mirrors can operate with their transistors biased in strong inversion, weak inversion or even as CMOS compatible lateral bipolar devices. If biased in weak inversion or as lateral bipolars, the current mirror gain ...

In low power current mode signal processing circuits it is often necessary to use current mirrors to replicate and amplify/attenuate current signals and clamp the voltage of nodes with high parasitic capacitances so that the smallest currents do not introduce unacceptable delays. The use of tunable active-input current mirrors would meet both requirements. In conventional active-input current mirrors, stability compensation is required. Furthermore, once stabilized, the input current cannot be made arbitrarily small. In this paper we introduce two new active-input current mirrors that clamp their input node to a given voltage. One of them does not require compensation, while the other may under some circumstances. However, for both, the input current may take any value. The mirrors can operate with their transistors biased in strong inversion, weak inversion, or even as CMOS compatible lateral bipolar devices. If it is biased in weak inversion or as lateral bipolars, the current mirror...

Abstract not found