A 35-mW 30-dB Gain Control Range Current Mode Linear-in-Decibel Programmable Gain Amplifier With Bandwidth Enhancement

作者：Kumar Thangarasu Bharatha^*; Ma Kaixue; Yeo Kiat Seng; Yang Wanlan

来源：IEEE Transactions on Microwave Theory and Techniques, 2014, 62(12): 3465-3475.

DOI：10.1109/TMTT.2014.2364221

• Bandwidth enhancement technique
• common-mode feedback (CMFB)
• current mode design
• dB linearity
• dc offset cancellation (DCOC)
• digital gain control
• digital variable gain amplifier (DVGA)
• exponential current converter
• interconnect network
• linear-in-decibel gain control
• linearizer
• low power design
• programmable gain amplifier (PGA)
• SiGe BiCMOS
• variable gain amplifier (VGA)

This paper presents the design of a programmable gain amplifier (PGA) that serves as an interface between the receiver front-end and the baseband processor. The proposed PGA design is fabricated in a commercial 0.18-mu m SiGe BiCMOS process with a topology consisting of two digitally variable gain amplifiers cascaded by a post amplifier and interconnected by differential wideband matching networks that presents an overall enhanced gain bandwidth product. By using the current mode exponential gain control technique, the proposed design achieves a broad 30-dB linear-in-decibel gain range, a gain-independent output 1-dB compression point better than -10 dBm, input/output return loss better than 13 dB, a +/- 0.75-dB gain flatness over a multi-decade frequency range from 2.5 MHz to 1.17 GHz, a measured in-band group-delay variation of 30 ps, a 35-mW power consumption, and a 0.25-mm(2) core die area.

• 出版日期2014-12