Journal Press India^®

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Design of a programmable frequency oscillator design using field programmable, analog, CMOS current conveyor has been presented; further, a design methodology to introduce on-chip /field programmability into the second generation current controlled current conveyor circuit (CCCII) is explained. To make the CCCII CMOS design programmable, a floating-gate transistor synapse is introduced to replace the MOSFETs in the design. The charge at the floating-gate can be programmed after fabrication, based on Hot-e-injection and Fowler-Nordheim tunneling techniques. This programming charge at floating-gate results in threshold voltage variation in such floating-gate (FG) MOSFETs, which in turn can modifies circuit specifications after fabrication. The high frequency small signal analysis of the design has been discussed and specifications of the design are derived in terms of threshold voltages of the respective FG-MOSFETs. To achieve CCCII circuit’s AC and DC characteristics and to obtain programmable oscillations, the programmable CCCII and oscillator circuit using programmable CCCII, are simulated using BSIM3 level49 MOSFET models in T-Spice 0.35μm CMOS process. The simulated results show 13bit programming precision in current gain, 3dB bandwidth, input impedance, output impedance and dc offsets with respect to threshold voltage of respective FG-MOSFETs. Moreover on employing CCCII design with programmable current gain (about 0.91258- 1.2138) in an oscillator design with minimum passive components, variable amplitude oscillations can be generated.

Keywords

Analog Circuits; Current Controlled Current Conveyor; Floating Gate; Oscillator; Specifications; Threshold Voltage.

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