Novel preamplifiers for working standard photoconductive (PC) and photovoltaic (PV) HgCdTe detectors have been developed to maintain the spectral responsivity scale of the National Institute of Standards and Technology (NIST) in the wavelength range of 5 μm to 20 μm. The linear PC mode preamplifier does not need any compensating source to zero the effect of the detector bias current for the pre...

The instrumentation and practical circuitry required for the detection of negative ions exiting the mass analysis section of a mass spectrometer is examined. The potentials needed to bias the electron multiplier when detecting negative ions from a low ion-energy mass spectrometer, e.g., a quadrupole, are contrasted with the biasing requirements of a mass spectrometer having high ion-energies, e...

OBJECTIVES Acceleration plethysmogram (APG) obtained from the second derivative of photoplethysmography (PPG) is used to predict risk factors for atherosclerosis with age. This technique is promising for early screening of atherosclerotic pathologies. However, extraction of the wave indices of APG signals measured from the fingertip is challenging. In this paper, the development of a wave detec...

According to our simulations [1], a preamplifier-shaper has been designed. It has 8 channels. Each channel consists of a charge preamplifier and a CR-RC shaper to limit noise. Thermal and shot noise has been simulated as 300 e-. Since the foreseen leakage current is not more than 10 nA, the preamplifier has a sensitivity of 155 mV/MIP, in order to achieve the assigned 7 Mip range. The shaper ha...

This work presents a low-voltage, low power CMOS symmetrical operational transconductance amplifier (OTA) and its application for realization of a biopotential amplifier in neural recording application. The linear range of OTA is increased by employing multi-tanh differential configuration and source degeneration while the commonmode range is enhanced using DC-shifting scheme. The proposed symm...

We have designed a process-insensitive preamplifier for an optical receiver, fabricated it in several different minimum feature sizes of standard digital CMOS, and demonstrated design scaleability of this analog integrated circuit design. The same amplifier was fabricated in a 1.2 μm and two different 0.8 μm processes through the MOSIS foundry [1]. The amplifier uses a multistage, low-gain-per-...

Extensional-mode quartz resonators are being increasingly used as force sensors in dynamic scanning force microscopy or atomic force microscopy (AFM). We propose a voltage preamplifier in order to amplify the charge induced on quartz electrodes. The proposed solution has some advantages over the typically used current-to-voltage converters. First, the gain does not depend on the inner parameter...

A transimpedance ampli er with nominal performance of 355MHz bandwidth, 20.6k transresistance, total equivalent input current noise of 43.1nA rms, and power dissipation of 20.7mW is presented.

Several pin-diode preamplifiers have been implemented in bipolar and CMOS processes for electrooptic digital signal transmission. We present a new pin-diode receiver preamplifier optimised for analog signal transmission. The design is based on the active feedback transimpedance circuit which does not require on-chip passive components. The preamplifier has been designed and fabricated in a 0.7μ...

In traditional comparators especially for ADCs, one serious problem is the kick back noise, which disturbs the input signal voltages and consequently might cause errors at the outputs of the ADCs. In this paper, we will work on a novel ultra low-power rail-to-rail CMOS latched comparator with very low kickback noise for low to medium speed ADCs. This comparator adopts a preamplifier followed by...