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A microwave rectifier for 5.8 GHz operation without any capacitors is presented, which has a measured MW-to-DC conversion efficiency of 61%. A coupled band pass filter and a class-F load are utilized to suppress diode harmonics and replaced the capacitors in conventional microwave rectifiers. The imaginary part of the diode impedance is canceled by a parallel microstrip line to enhance its rectifying...
Low power smart electronic designs for neural recording applications have recently become a major research topic in circuits and system society. Challenged by the complicated nature of the biology-electronic interface, implantable neural recording circuits must offer high quality signal acquisition while consuming as little power as possible. Furthermore, many applications demand on-chip smart features...
Universal 2nd-order current-input current-output filter containing two active elements, namely VDTAs (Voltage-Differencing Transconductance Amplifiers), and two grounded capacitors is described. The circuit topology starts from the well-known two-integrator flow graph of the classical KHN (Kerwin-Huelsman-Newcomb) biquad.
Implantable medical devices such as pacemakers, internal cardi-ac defibrillator (ICD), and cardiac resynchronization therapy (CRT) devices have conducting leads that are used to sense the heart signals and to pace into the heart muscle in order to artificially stimulate it. The sensing system in these devices monitor patient's heart signals continually; therefore, it must always remain powered-up...
This paper presents a new high-input impedance electronically tunable voltage-mode universal filter with one input and five outputs employing eight single-ended operational transconductance amplifiers and two grounded capacitors. The proposed circuit can simultaneously realize voltage-mode low-pass, band-pass, high-pass, band-stop and all-pass filter without inverting-type input signals and component-matching...
Second order filter structures have widespread applications. They are also used in realization of higher order filter. Among the second order filters, KHN (Kerwin, Huelsman, and Newcomb) filter is used as a reference while designing second order filters with other active elements. A new KHN filter, employing two OTA's, two ground capacitance and one resistance is proposed in this paper. The Q and...
A programmable active-RC low-pass filter is presented with tunable bandwidth realized with a fast tuning circuit suited for a zero-IF transceiver. The filter adopts a 3rd-order Bessel low-pass architecture. Its −3dB bandwidth can be programmed to 250K, 500K, 1M and 2MHz.An operational amplifier with adaptive Miller compensation is designed to maintain the stability of the circuit when the filter is...
In this paper, two new single-input five-output (SIFO) voltage-mode (VM) second-order universal filters are presented. The proposed filters employ two triple-output second-generation current conveyors (TO-CCIIs) as active elements, five resistors and two grounded capacitors. The proposed filters provide all of the standard filter responses (i.e. low-pass, band-pass, high-pass, notch and all-pass responses)...
This paper presents a new electronically tunable voltage-mode universal biquadratic filter with single input and four outputs employing seven operational transconductance amplifiers and two grounded capacitors. The use of grounded capacitor makes the circuit ideal for integrated circuit implementation. The proposed filter can realize voltage-mode low-pass, band-pass, high-pass and band-stop filter...
This article presents a current-mode multifunction biquadratic filter performing completely standard functions low-pass, high-pass, band-pass, band-reject and all-pass functions. The circuit principle is based on second-generation current-controlled current conveyor (CCCII) with three input terminals and one output terminal. The features of the circuit are that, the pole frequency can be electronically...
In order to overcome some practical design and implementation issues of real active-only filters, a lossless integrator that employs one current controlled current conveyor and one voltage buffer with adjustable gain is presented. A real active-only filter circuit based on this integrator block is presented and designed. The feasibility of this filter in a 0.35µm CMOS process is verified through SPECTRE...
This article presents a four-inputs single output biquadratic filter performing completely standard functions: low-pass, high-pass, band-pass, band-reject and all-pass functions, based on single current controlled current follower transconductance amplifier (CCCFTA). The features of the circuit are that; the quality factor and natural frequency can be tuned electronically via the input bias current;...
This paper presents a current-tunable current-mode universal biquadratic filter with two inputs and two outputs using one modified current-controlled current differencing transconductance amplifier, two grounded capacitors and one grounded resistor. The proposed circuit provides following advantages: realization of low-pass, band-pass, high-pass, band-stop and all-pass current responses; orthogonal...
This paper presents a new voltage-mode three-input three-output universal filter using single-ended operational transconductance amplifiers (OTAs) and grounded capacitors. The circuit provides low-pass, high-pass, band-pass, band-stop and all-pass voltage responses at a high impedance input terminal, which enable easy cascadability. The natural frequency (ωo) and the quality factor can be controlled...
This paper presents a new versatile multifunction voltage-mode biquadratic filter with three inputs and four outputs employing single-ended operational transconductance amplifiers (OTAs) and grounded capacitors. The proposed circuit provides the following advantages: (i) employment single-ended OTA and grounded capacitor which is highly suitable for integrated circuit implementation, (ii) simultaneously...
A flexible spectrum-sensing receiver in 65nm CMOS consists of a wideband front-end, spectrum-adaptive (SA) filtering, switched-capacitor amplifiers, and a filtering SAR ADC. The SA filter uses a DT spectrum-analyzer and a reconfigurable DT notch filter to detect and suppress large interferers over a 55MHz range. In IEEE 802.15.4 tests, the receiver exceeds sensitivity and interferer rejection requirements...
Using a multilayer organic package substrate, we demonstrate that future system-on-chip with co-existing digital and radio integrated circuits can be partitioned to have critical RF inductors/transformers on package and active devices and capacitors on silicon, which enables cost and form factor reduction as well as design of radios on low resistivity substrate. As proof of concept, we present an...
A new system level architecture for multi-standard receivers to cover all the VHF and UHF band avionic systems is proposed. The proposed architecture relies on special RF front-end filtering to separate different services. A dual band-pass filter is designed using only two resonators. The resonators are designed and fabricated in LTCC technology using a lumped element approach. Measured results show...
This paper presents a new electronically tunable voltage-mode first-order allpass filter using only three single-ended operational transconductance amplifiers (OTAs) and one grounded capacitor, which is highly suitable for integrated circuit implementation. The pole frequency of the filter can be tuned electronically by adjusting the transconductance value of the OTA. No component-matching conditions...
This paper presents a new electronically tunable versatile voltage-mode biquadratic filter with three inputs and six outputs using operational transconductance amplifiers and grounded capacitors. The proposed circuit provides simultaneously realize voltage-mode low-pass, band-pass, high-pass, band-stop and allpass filter responses. The natural frequency and the quality factor can be set orthogonally...
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