Stanislaw Szczepanski

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This paper describes a CMOS time-to-digital converter (TDC) integrated circuit utilizing tapped delay lines. A technique that allows the achievement of high resolution with low dead-time is presented. The technique is based on a Vernier delay line (VDL) used in conjunction with an asynchronous read-out circuitry. A delay-locked loop (DLL) is used to(More)
A programmable high-frequency operational transconductance amplifier (OTA) is proposed and analyzed. A general configurable analog block (CAB) is presented, which consists of the proposed programmable OTA, programmable capacitor and MOSFET switches. Using the CABs, the universal tunable and field programmable analog array (FPAA) can be constructed, which(More)
Highly linear operational transconductance amplifier (OTA) is developed, using CMOS differential pair transconductors in an active-error feedforward linearization configuration. As a result, improved linearity of the differential-input two-output OTA is obtained. SPICE simulations show that for the circuit working with a 1.25V power supply, total harmonic(More)
A general framework for performance optimization of continuous-time OTA-C filters is presented. Efficient procedures for evaluating nonlinear distortion and noise valid for any filter of arbitrary order are developed based on matrix description of a general OTA-C filter model. A systematic optimization procedure using equivalence transformations is(More)
An analytical method based on the standard square-law metal–oxide–semiconductor (MOS) modeling for the design of highly linear, fully differential complementary metal–oxide–semiconductor (CMOS) operational transconductance amplifier (OTA) is presented. The proposed circuit implementation combines a cross-coupled quad cell and a source-coupled differential(More)
1 4 Proarammable Current Mirror A general configurable analog block (CAB) is presented, which consists of the programmable OTA, programmable capacitor and MOSFET switches. Using the CABs, the universal tunable and field programmable analog array (FPAA) can be constructed, which can realize many signal-processing functions, including filters. A prototype 5x8(More)
A high-frequency fully differential CMOS operational transconductance amplifier (OTA) is presented for continuous-time filter applications in the megahertz range. The proposed design technique combines a linear cross-coupled quad input stage with an enhanced folded-cascode circuit to increase the output resistance of the amplifier. SPICE simulations show(More)