We describe a model predicting the output torque of the battery-amplifier-actuator-gear combination used on the hexapod robot RHex, based on requested PWM (PulseWidth-Modulation) duty cycle to the amplifier, battery voltage, and motor speed. The model is broken into independent components, each experimentally validated: power source (battery), motor amplifier, motor, and (planetary) gear. The r...

In this paper we have describes the design of current mode instrumentation amplifier (CMIA) for bio-signal Acquisition system. The current mode instrumentation amplifier technology is based on voltage mode operational amplifier (op amp) power supply current sensing technique. There are two design challenges of this topology. First one is the Op amp mismatch and second is precise current mirrors...

This paper presents the design of a high efficiency, low THD, 5.7GHz fully differential power amplifier for wireless communications in a standard 0.18μm CMOS technology. The power amplifier employs a fully differential class-E topology to achieve high power efficiency by exploiting its soft-switching property. In order to achieve high operating frequency, an injectionlocked oscillator is utiliz...

For my final project, I will be constructing a 70V audio amplifier capable of delivering about 200 watts into a network of transformer coupled loudspeakers. My design utilizes a class G (rail switching) output stage for increased efficiency and lessened cooling requirements. The rest of the amplifier circuit is fairly standard: an input differential pair with negative feedback from the amplifie...

We present the design of Analog front end (AFE) low noise pre-amplifier implemented in a high voltage 0.18-μm CMOS technology for a three dimensional ultrasound bio microscope (3D UBM) application. The fabricated chip has 4X16 pre-amplifiers implemented to interface a 2-D array of high frequency capacitive micro-machined ultrasound transducers (CMUT). Core AFE cell consists of a high-voltage pu...

We demonstrate a high-performance cryogenic amplifier based on a radio-frequency single-electrontransistor ~rf-SET!. The high charge sensitivity and large bandwidth of the rf-SET, along with low power dissipation, low capacitance and on-chip integrability, make it a good candidate for a general-purpose cryogenic amplifier for high impedance sources. We measure a large-gate rf-SET with an open-l...

Th is paper presents a programmable resistor using two-input floating gate MOS transistor (FGMOST). One of the two-input gates is connected to the drain and the other is connected to a tuned voltage to control the floatin g gate transistor resistance. A wide range of the programmable resistance is achieved by controlling the tuned voltage. The resistance is changed by 33% by varying the tuned v...

The tradition of implementing analogue circuits by means of voltage amplifiers is almost as old as the concept of electronic circuit design. The integrated electronic circuit, however, is a relatively new concept. Furthermore, integrated electronic circuits have significantly different limitations and strengths to the conventional discrete electronic circuits have. Since the active devices in i...

The injection-locked power amplifier (ILPA) has demonstrated relatively high gain and high efficiency at millimeter-wave frequency. However, their application is still limited by its sensitivity to loading effect and narrow injection locking bandwidth. In this letter, a wide injection locking ILPA using buffered input and output has been proposed and implemented on 65 nm CMOS technology. The bu...