scholarly journals A Novel Current–Mode High–Frequency Polyphase Filter using Multi–Output Current Differencing Transconductance Amplifiers

2016 ◽  
Vol 67 (5) ◽  
pp. 311-322
Author(s):  
Hao Peng ◽  
Chunhua Wang ◽  
Xiaotong Tian
Keyword(s):  
Input Impedance ◽  
Current Mode ◽  
Output Impedance ◽  
Output Current ◽  
Polyphase Filter ◽  
Low Input ◽  
Centre Frequency ◽  
Transconductance Amplifiers ◽  
High Output Impedance ◽  
High Output

Abstract This paper introduces a novel polyphase filter working at high centre frequency using multi-output current differencing transconductance amplifiers (MOCDTAs). The MOCDTA possesses characteristics of low input impedance, high output impedance, wide work frequency and linearly adjustable transconductance. The proposed filter consists of two MOCDTAs, two grounded capacitors, and no resistors. The features of low input impedance and high output impedance make it suitable for cascade. The bandwidth and centre frequency could be adjusted independently by external bias voltage VC and VCa. The image rejection ratio (IRR) could reach 31.6 dB at the centre frequency of 114 MHz, and its bandwidth could be 11.1 MHz. Besides, the centre frequency could be tuned from 38 MHz to 150 MHz with bandwidth of 20.1 MHz. Simulation results which verify the theory are included.

A CMOS CURRENT RECTIFIER CONFIGURATION SUITABLE FOR INTEGRATION

2012 ◽  
Vol 21 (07) ◽  
pp. 1250052 ◽  
Author(s):  
ERKAN YUCE ◽  
HALIL ALPASLAN
Keyword(s):  
Current Mode ◽  
Output Impedance ◽  
Output Current ◽  
Spice Simulation ◽  
Full Wave ◽  
Half Wave ◽  
Circuit Structure ◽  
Simulation Results ◽  
High Output Impedance ◽  
High Output

In this paper, a CMOS-based one input-two output current-mode (CM) circuit structure for providing full-wave rectification and half-wave rectifications to clarify the theory is proposed. The suggested configuration has many important advantages such as dissipating very less power, employing reduced number of CMOS transistors, having high output impedance currents and without requiring any additional bias currents and voltages. In order to exhibit performance and effectiveness of the proposed topology, SPICE simulation results are given.

scholarly journals The Design of a Charge Pump Circuit and System with Input Impedance Modulation for a Flexible-Type Thermoelectric Generator with High-Output Impedance

Electronics ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 1212
Author(s):  
Kazuma Koketsu ◽  
Toru Tanzawa
Keyword(s):  
Input Impedance ◽  
Thermoelectric Generator ◽  
Charge Pump ◽  
Operating Voltage ◽  
Output Impedance ◽  
Two Phase ◽  
Pump System ◽  
High Output Impedance ◽  
A Charge ◽  
High Output

This paper describes a charge pump system for a flexible thermoelectric generator (TEG). Even though the TEG has high-output impedance, the system controls the input voltage to keep it higher than the minimum operating voltage by modulating the input impedance of the charge pump using two-phase operation with low- and high-input impedance modes. The average input impedance can be matched with the output impedance of the TEG. How the system can be designed is also described in detail. A design demonstration was performed for the TEG with 400 Ω. The fabricated system was also measured with a flexible-type TEG based on carbon nanotubes. Even with an output impedance of 1.4 kΩ, the system converted thermal energy into electric power of 30 μW at 2.5 V to the following sensor ICs.

Sign in / Sign up

Export Citation Format

Share Document