Title :
A CMOS readout circuit for pico-ampere thin film pyroelectric array detectors
Author :
Reimann, T. ; Krummenacher, F. ; Willing, B. ; Mural, P. ; Declercq, M.
Author_Institution :
Electron. Lab., Swiss Fed. Inst. of Technol., Lausanne, Switzerland
Abstract :
A 16-channel readout circuit able to process low frequency modulated (1-10 hertz) current signals in the pico-ampere range from a thin film pyroelectric array detector has been integrated in a 0.7 μm CMOS technology. Each channel consists of a high gain (14 GΩ) transimpedance preamplifier having an input-referred current noise spectral density of 1.5 fA/√Hz at 10 Hz. A multiplier for demodulating the signal follows the preamplifier (chopper frequency fixed at 10 Hz). Finally, the signal is integrated over 8 periods before being converted by a 12-bit A/D converter. The multiplication, the integration and the A/D conversion are implemented within a single block using a first-order switched-capacitor incremental A/D converter architecture
Keywords :
CMOS analogue integrated circuits; analogue processing circuits; analogue-digital conversion; preamplifiers; pyroelectric detectors; readout electronics; 0.7 micron; 1 to 10 Hz; 12 bit; A/D conversion; CMOS readout circuit; CMOS technology; first-order switched-capacitor circuit; incremental A/D converter architecture; input-referred current noise spectral density; low frequency modulated current signals; pico-ampere range; pyroelectric array detectors; thin film pyroelectric; transimpedance preamplifier; CMOS process; CMOS technology; Detectors; Frequency modulation; Integrated circuit technology; Preamplifiers; Pyroelectricity; Sensor arrays; Signal processing; Thin film circuits;
Conference_Titel :
Custom Integrated Circuits Conference, 2000. CICC. Proceedings of the IEEE 2000
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-5809-0
DOI :
10.1109/CICC.2000.852694
