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Voltage-controlled filter

About: Voltage-controlled filter is a research topic. Over the lifetime, 5514 publications have been published within this topic receiving 70872 citations. The topic is also known as: VCF.


Papers
More filters
Proceedings ArticleDOI
08 Apr 2002
TL;DR: A high-throughput low-latency digital finite impulse response (FIR) filter has been designed for use in partial-response maximum-likelihood (PRML) read channels of modern disk drives, and offers a worst-case latency of only 10 ns, which is half the worst- case latency of the best previously reported comparable fully-synchronous implementation.
Abstract: A high-throughput low-latency digital finite impulse response (FIR) filter has been designed for use in partial-response maximum-likelihood (PRML) read channels of modem disk drives. The filter is a hybrid synchronous-asynchronous design. The speed critical portion of the filter is designed as a high-performance asynchronous pipeline, sandwiched between synchronous input and output portions, making it possible for the entire filter to be dropped into a clocked environment. A novel feature of the filter is that the degree of pipelining is dynamically variable, depending upon the input data rate. This feature is critical in obtaining a very low filter latency throughout the range of operating frequencies. The filter was fabricated in a 0.18 /spl mu/m CMOS process. Resulting chips were fully functional over a wide range of supply voltages, and exhibited throughputs of over 1.3 Giga items/second, and latencies as low as four clock cycles. The internal asynchronous pipeline was estimated to be capable of significantly higher throughputs, around 1.8 Giga items/second. With these performance metrics, the filter has better performance than that reported for existing digital read channel filters.

36 citations

Patent
Guenter Dehner1
29 Oct 1984
TL;DR: In this article, a computer tomography system has an X-ray source and a radiation receiver having an array of individual detectors each forming an electrical signal corresponding to the received radiation intensity, the Xray source being rotated about a subject for transradiating a layer of the subject from different directions, and a measured value processing circuit to which the output signals of the individual detectors are supplied.
Abstract: A computer tomography system has an X-ray source and a radiation receiver having an array of individual detectors each forming an electrical signal corresponding to the received radiation intensity, the X-ray source being rotated about a subject for transradiating a layer of the subject from different directions, and a measured value processing circuit to which the output signals of the individual detectors are supplied and which identifies therefrom attenuation values of predetermined points in the transradiated plane of the subject for generating a display image. The measure value processing circuit has a convolution computer, and further has an adaptive digital filter and a filter control unit to which the signals from the array are supplied before being operating on by the convolution computer. The filter control unit controls the transfer function of the filter as a function of the filter input signal so as to substantially reduce image artifacts due to quantum and electronics noise.

36 citations

Journal ArticleDOI
TL;DR: A flexible current-reuse operational amplifier with a power-scaling technique is proposed to lower the power consumption, and the image-rejection ratio is improved by almost 20 dB by introducing an I/Q imbalance calibration circuit before the filter.
Abstract: A power-scalable reconfigurable filter with in-phase/quadrature (I/Q) imbalance calibration for a multimode Global Navigation Satellite Systems (GNSS) receiver is presented. The filter is reconfigurable as either a fifth-order complex bandpass filter exhibiting a tunable intermediate frequency (4.092, 6.138, 10.23, 12.296, 13.29, 18.4, and 20.442 MHz) and bandwidth (2.2, 4.2, 8, 10, and 18 MHz) or a third-order low-pass filter with tunable bandwidth (5 and 9 MHz). A flexible current-reuse operational amplifier with a power-scaling technique is proposed to lower the power consumption, and the image-rejection ratio is improved by almost 20 dB by introducing an I/Q imbalance calibration circuit before the filter. The filter, which was implemented in 65-nm CMOS, consumes 2.9-19.5 mW in different modes, with the I/Q calibration circuit consuming 0.9 mW.

36 citations

Journal ArticleDOI
TL;DR: In this paper, a compact electronically switchable parallel-coupled microstrip bandpass filter (BPF) based on quarter-wavelength resonators and p-i-n diode switch is proposed.
Abstract: In this letter, a compact electronically switchable parallel-coupled microstrip bandpass filter (BPF) based on quarter- wavelength resonators and p-i-n diode switch is proposed. The proposed filter occupies only half the circuit size of the conventional parallel-coupled filter. In addition, the type and length of each coupled-line section is suitably chosen such that the inherent transmission zeros associated with the coupled-lines can be used to reject the spurious passbands effectively. By adding only one p-i-n diode along with a simple bias control circuitry, the proposed filter becomes electronically switchable with no current consumption when the filter is turned off. Specifically, a switchable fourth-order microstrip BPF with a center frequency f0 of 2 GHz, passband insertion loss less than 3 dB, and wide stopband up to 7.7 f0 in the ON state is demonstrated. The isolation of the filter is better than 30 dB from dc up to 7.7 f0 in the OFF state.

36 citations

Journal ArticleDOI
TL;DR: In this paper, a compact balanced bandpass filter is proposed using a novel circuit topology, which includes a differential resonator and a common resonator in the conventional quasi-lumped coupled-line circuit, instead of adopting quarterwavelength or halfwavelength transmission lines in the filter design.
Abstract: A compact balanced bandpass filter is proposed using a novel circuit topology, which includes a differential resonator and a common resonator in the conventional quasi-lumped coupled-line circuit, instead of adopting quarter-wavelength or half-wavelength transmission lines in the filter design. Based on this circuit topology, the balanced bandpass filter can support bandpass filtering function under differential-mode operation and exhibit bandstop filtering function under common-mode noise. By employing the advantage of the low-temperature co-fired ceramic fabrication technology, a compact balanced bandpass filter is centered at 3.42 GHz with fractional bandwidth 10.4% for differential signals and rejection band is from 1.48 to 7.4 GHz for the common-mode noise. Moreover, the proposed filter is able to introduce a transmission zero with excellent common-mode suppression (>;40 dB) within the differential-mode passband. The electrical size of this filter is 5.6 × 5.4 mm with the corresponding electrical size 0.113 × 0.109 λg, where λg is the guided wavelength at the center frequency 3.42 GHz. This compact balanced bandpass filter is suitable to be applied to the system-in-package technology for wireless application.

36 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20239
202229
20201
20188
2017150
2016199