This paper proposes a CMOS low-power low-voltage microphone preamplifier for a cochlear implant system. The proposed preamplifier using the Flipped Voltage Follower Current Sensing (FVFCS) technique to achieve low voltage, low power consumption. The proposed circuit was designed and simulated using a 0.35 m CMOS process. Simulation results showed that the preamplifier can achieve 22-dB voltage ...

Introduction: Coil arrays for signal reception are widely used in MRI to obtain high local SNR [1] and for improved imaging speed [2]. Increasing the channel number in the coil array, the single coil element in every channel becomes smaller, respectively. Thus, higher gain is required for preamplifiers to improve low signal level to acceptable values. However, high gain is a conflicting goal wi...

This paper presents the comparison between CMOS dynamic latch comparators. The circuit has been simulated using SPICE tool with 0.35μm technology, supply voltage of 3 V and 3.3 V respectively. The circuits studied and simulated in this paper are Preamplifier dynamic latch circuit that consists of a preamplifier followed by a double regenerative dynamic latch and the Buffered dynamic latch circu...

A 0.18μm CMOS low-noise wideband charge sensitive preamplifier (CSP) used in a high precision pixel detector was presented in this paper. The preamplifier consists of charge amplification and constant current feedback circuit to accumulate the input charge signal in the feedback capacitor and discharge it by constant current. The open-loop gain of the preamplifier is 52dB at DC, and -3dB bandwi...

The open-circuit sensitivity of condenser microphones, and in particular Laboratory Standard (LS) and Working Standard (WS) microphones, depend on the mechanical ground-shield configuration of the preamplifier. Therefore, the mechanical ground-shield configurations of preamplifiers for LS and WS microphones are defined in the IEC 61094 standard series. The sensitivity, dynamic range and acousti...

This paper describes a CMOS optical preamplifier suitable for infrared wireless data communications. The preamplifier consists of a differential CMOS variable-gain transimpedance amplifier embedded in a larger feedback loop used to reject photocurrents generated by ambient light. Fabricated in a commercial 0.35m CMOS process, the preamplifier consumes 8 mW at 3 V, and provides 70-MHz bandwidth ...

In this paper, investigations are done for performance improvement of optimized SOA preamplifier [13] for 32, 64 channels and various channel spacing. The effects of number of channels and channel spacing are analyzed in terms of receiver sensitivity of the optimized preamplifier based optical receiver. General Terms: Pre-amplifier

We propose a differential-type complementary metal-oxide-semiconductor (CMOS) sub-terahertz (THz) detector with a subthreshold preamplifier. The proposed detector improves the voltage responsivity and effective signal-to-noise ratio (SNR) using the subthreshold preamplifier, which is located between the differential detector device and main amplifier. The overall noise of the detector for the T...

An analog front-end composed of a preamplifier and a Σ-∆ modulator is proposed and implemented for digital hearing aid chip. Combined gain control (CGC), the technique, which incorporates an automatic gain control (AGC) with an exponential gain control (EGC), is employed to enlarge dynamic range and reduce power consumption. The proposed Σ-∆ modulator exploits adaptive-SNR technique, which gene...

This paper discusses certain important issues involved in the design of a nerve signal preamplifier for implantable neuroprostheses. Since the electroneurogram signal measured from cuff electrodes is typically on the order of 1 V, a very low-noise interface is essential. We present the argument for the use of BiCMOS technology in this application and then describe the design and evaluation of a...