Low Noise

We have developed a novel analog front-end part of a wireless brain oxymeter receiver instrument based on near-infrared spectroreflectometry (NIRS). The NIRS receiver makes use of dynamic threshold transistors (DTMOS) for low voltage (1–V), low power and low noise enhancement. The design is composed of a transimpedance amplifier (TIA) and an operational transconductance amplifier (OTA). The OTA differential input pairs are in a class AB configuration, and uses DTMOS devices for input common-mode range enhancement. Post-layout simulations under a 5 pF load, using 0.18 µm CMOS technology results are, for the OTA, an input referred noise of 134 nV/√Hz at 1 kHz, and a power consumption of 16.7 µW without any extra noise reduction technique. Also, the TIA gives 208 pA/√Hz at 1 kHz, while having a power consumption of only 10.9 µW. The proposed analog front-end circuits have been used to implement a NIRS receiver instrument with improved ultra low-light level measurements, high resolution...

Improving the of radio telescopes and ra- diometers and their associated receive subsystems translates into increasing the ground received signal-to-noise ratios. Therefore, low noise amplification with cooling operation is required. How- ever, the system designer must select an appropriate feedhorn antenna with low sidelobes and an adapted illumination at the edge of the reflector since the noise originated from the

The limits of the noise performance of detector readout front ends in CMOS technology have been studied. A theoretical minimal number of equivalent noise charge (ENC) that can be achieved by a CMOS technology is derived, taking both thermal noise and 1/f noise into account. Design criteria and techniques of CMOS readout front ends are presented so as to fully

A novel design of low noise amplifier for medical ultrasound transducers is described in this paper. Unlike conventional low noise preamplifiers, this design proposes a new circuit configuration which has electronically adjustable matching resistance that allows the preamplifier to be compatible with a variety of medical ultrasound transducers. The design employs current feedback operational amplifier to enhance the gain-bandwidth independence

This paper presents an analysis of sub-2.5-V topologies and design methodologies for SiGe BiCMOS and sub-90nm CMOS building blocks to be used in the next generation of 40-100 Gb/s wireline transceivers. Examples of optimal designs for 40-80Gb/s broadband low-noise input comparators, low-voltage high-speed MOS- and BiCMOS CML logic gates, 30-100 GHz low-noise oscillators, and 40/80 GHz output drivers with wave shape control are provided.

The design of a miniaturized FM radio transmitter using a tunnel diode as the main active element to broadcast information regarding body activity such as muscle and heart potentials to a remote receiver and recorder is reported. This FM transmitter has extremely high sensitivity. A maximum value of 500 kc/mV is obtained. The equivalent input noise of the complete transmitter