A DC–10 GHz amplifier with digital offset correction

✍ Scribed by Hans Gustat

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 353 KB
• Volume: 8
• Category: Article
• ISSN: 1369-8001
• DOI: 10.1016/j.mssp.2004.09.064

✦ Synopsis

This work presents a SiGe:C wideband amplifier with a binary CMOS counter for digital offset adjustment. The application of the ''radixo2'' approach to accurate offset correction in a digital calibration loop results in smaller area and less power than common static high-resolution offset correction circuits. The counter bits are weighted with a radix of 1.6, leading to 25% error tolerance, and thus simple circuits and small devices. A BiCMOS test chip in a 0.25-mm-CMOS 200-GHz-SiGe:C technology exhibits a correction accuracy well below the measurement noise floor of 50 mV at only 1 mW additional power consumption. The amplifier operates from DC to 10 GHz on a 3 V supply voltage. Since the adjustment compensates device mismatch, minimum-size transistors can be used. This in turn enhances the RF performance.