A 1.2-V Feedforward Amplifier and A/D Converter for Mixed Analog/Digital LSIs (Special Issue on Low-Power LSI Technologies)

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概要

• 論文の詳細を見る

• Very-low-voltage 1.2-V mixed-signal CMOS technology is a device/circuit solution aimed at ultra-low-power portable systems such as digital cellular terminals and PDAs.We have developed an experimental 1.2-V mixed analog and digital LSI circuit/device technology. This technology is based on a new transistor structure that has a 0.3-μm gate length and a low V_<th> of 0.4 V, and that suppresses the short-channel effect.In this paper, we will mainly discuss low-voltage analog circuit design that uses this technology. We show that low V_<th> is essential not only to digital circuits, but also to 1.2-V analog amplifier, A/D converter and analog switch designs. To achieve high-conversion rate A/D converters, a pipeline architecture is used for low-voltage operation. To increase the attainable gain-bandwidth of the operational amplifier of the converter, a feedforward phase-compensated three-stage amplifier is proposed. The addition of a feedforward capacitor allows a high frequency signal to pass directly to the second stage, which optimizes use of the second stage bandwidth. Pole-zero canceling is used to achieve a fast settling of the amplifier. Although gain precision is degraded by the positive feedback through the feedforward capacitor, this can be offset by increasing the equivalent second-stage gain with an inner feedforward compensated amplifier. The gain-bandwidth of the proposed double feedforward amplifier is two to three times wider than with the conventional Miller compensation. With these techniques, we used 1.2-V mixed-signal CMOS technology to create a basic logic gate with a 400-ps delay/and 0.4-μW/MHz power, and a 9-bit 2-Msample/s pipeline A/D converter With power dissipation of only 4 mW.

• 社団法人電子情報通信学会の論文
• 1996-12-25

著者

• Imaizumi Eiki

  Hitachi Ulsi Engineering Corp.

• MATSUURA Tatsuji

  Semiconductor and Integrated Circuits Group, Advanced Analog Technology Center, Hitachi, Ltd.

• ANBO Takanobu

  Hitachi ULSI Engineering Corp.

• Matsuura Tatsuji

  Semiconductor & Integrated Circuits Div. Hitachi Ltd.

関連論文

• SAR ADC Algorithm with Redundancy and Digital Error Correction
• A 3.2-mA 6-Bit Pipelined A/D Coverter for a Bluetooth RF Transceiver(Special Issue on High-Performance Analog Integrated Circuits)
• A 10-bit 3-Msample/s CMOS Multipath Multibit Cyclic ADC (Special Issue on Low-Power High-Speed CMOS LSI Technologies)
• A 1.2-V Feedforward Amplifier and A/D Converter for Mixed Analog/Digital LSIs (Special Issue on Low-Power LSI Technologies)
• Substrate Noise Reduction Using Active Guard Band Filters in Mixed-Signal Integrated Circuits (Special Section on Analog Circuit Techniques for System-on-Chip Integration)
• SAR ADC Architecture with Digital Error Correction

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