A novel input stage for low-voltage, low-noise preamplifiers for integrated capacitive sensors is presented. The input stage of the preamplifier employs floating-gate MOS transistors which are capable of storing the operation point of the input stage over several years without any severe degradation of the performance of the circuit and without the need for a repeating programming. In this way the noise originating from any resistance previously used for the definition of the operating point is avoided completely and, moreover, by avoiding the input high-pass filter both the saturation of the input stage is abolished and very-low-frequency signal can be handled. A preamplifier using the proposed input stage, optimized for lowest white noise operation has been fabricated in a 0.8 micron CMOS process. The circuit operates with a power supply of 1.5V and consumes only a little bias current.
|Title of host publication||Proc. 1997 European Conference on Circuit Theory and Design, vol.2|
|Place of Publication||Budapest|
|Publisher||Technical University of Budapest|
|Publication status||Published - 1997|
|Event||European Conference on Circuit Theory and Design (ECCTD'97) - Budapest|
Duration: 1 Jan 1997 → …
|Conference||European Conference on Circuit Theory and Design (ECCTD'97)|
|Period||01/01/1997 → …|
Igor, M. (1997). Input Stage for Low-Voltage, Low-Noise Preamplifiers Based on a Floating-Gate MOS Transistor. In Proc. 1997 European Conference on Circuit Theory and Design, vol.2 (pp. 990-995). Technical University of Budapest.