Masters Theses

Date of Award

12-1999

Degree Type

Thesis

Degree Name

Master of Science

Major

Electrical Engineering

Major Professor

T. V. Blalock

Committee Members

M. J. Roberts, Don Bouldin

Abstract

This thesis describes the measurement procedures employed to effectively characterize the Lucent Technologies Communications Signal Processor (CSP1009). The Results of these measurements are presented and discussed. This study was conducted on the first prototype to be manufactured. The CSP1009 is the analog baseband integrated circuit chip in a three-chip system designed for use in 900 MHz cordless telephones. Itwas fabricated using a 0.3µ CMOS process. The CSP1009 contains several amplifiers including a programmable gain amplifier (PGA), a telephone line driver amplifier and speaker driver amplifier. In addition, it contains a charge pump for use in a phase lock loop circuit, a bandgap reference, an analog to digital converter (ADC) and a digital to analog converter (DAC). The amplifiers were characterized by measuring three quantities; gain, power supply rejection ratio, and total harmonic distortion (THD). The Output current of the charge pump was measured. The voltage of the bandgap reference was measured at different temperatures. The current consumption of the individual modules was also measured. All of these measurements were taken over process variations and over changes in the power supply voltage. The programmable gain amplifiers have gains ranging from OdB to 44dB, PSRR of approximately 50dB, andTHD less than 0.2%. The reference voltage of 1 VDC is derived from the bandgap voltage reference. The charge pump output current is programmable and ranges from 100µA to 1600µA. The total current consumption of the CSP1009, under loaded conditions, was approximately 7mA. Most of the modules on the first prototype of theCSP1009 performed adequately. However, a few anomalies were found. These include aIVDAC offset, low charge pump current, PGA feed-through, and the frequency response of the double sampling circuit rolled off at a lower frequency than expected.

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