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# IEE Third one-day Colloquium on Analog Signal Processing (Digest No: 1996/236)

## Filter Results

Displaying Results 1 - 13 of 13
• ### Improving HF properties of limiters with modified bipolar transistors

Publication Year: 1996, Page(s):11/1 - 11/4
| | PDF (300 KB)

Very often the collector-to-substrate capacitance of bipolar transistors is the largest parasitic capacitor. This implies that in circuits in which the collector can not be short-circuited, like in resistor loaded differential pairs, the HF-behavior can deteriorate a lot. However, in the case of resistor loaded transistors, the influence of the capacitor can be reduced by placing a shielding impla... View full abstract»

• ### A novel approach to VLSI analogue design

Publication Year: 1996, Page(s):10/1 - 10/6
| | PDF (240 KB)

In general, analogue design is seen as a black art and is due to the lack of standardisation of the analogue design process. However, if analogue design is reduced to a subset of solutions then this situation will change. This paper presents a totally new approach to the analogue design process, and it is advantageous to consider the structure proposed here as a form of computer analogous in many ... View full abstract»

• ### Evolutionary design of analogue electronic circuits; current status

Publication Year: 1996, Page(s):7/1 - 7/8
Cited by:  Papers (3)
| | PDF (440 KB)

Analogue circuit design optimisation has for a long time been treated classically through a number of conventional optimisation techniques such as gradient methods or Hill-Climbing techniques. The component values produced by these conventional methods are typically assumed to be ideal with unrestricted values in a circuit configuration that is pre-defined. Therefore it would be very desirable to ... View full abstract»

• ### Circuit design study for a GaAs operational transconductance amplifier

Publication Year: 1996, Page(s):12/1 - 12/6
| | PDF (368 KB)

A GaAs Operational Transconductance Amplifier IC with a bandwidth of over 1 GHz has been designed and fabricated, for use in active OTA-C filter designs at radio frequencies. The design uses a Gilbert cell tunable transconductor and a new MESFET current mirror structure, and has been fabricated using a commercial 0.5 μm MMIC process View full abstract»

• ### Design of current-mode companding √-domain dynamic circuits

Publication Year: 1996, Page(s):8/1 - 8/5
Cited by:  Papers (4)
| | PDF (376 KB)

In this paper, the strong inversion MOS analogue of the log-domain principle, or dynamic translinear principle, is derived. The resulting class of √-domain circuits is based on the square law describing the large-signal behaviour of the MOS transistor in strong inversion. An inherent characteristic of √-domain filters is instantaneous companding, which is especially interesting for low... View full abstract»

• ### Reduction of 3rd order intermodulation distortion through the use of a high pass transmission line implementation of “derivative superposition”, and through the use of channel doped HEMTS

Publication Year: 1996, Page(s):13/1 - 1310
Cited by:  Papers (3)  |  Patents (1)
| | PDF (884 KB)

This paper describes the implementation of an amplifier with low 3rd order intermodulation distortion by using a combination of “Derivative Superposition” and high pass lumped element transmission lines. Measured results of a surface mount component version of the circuit are given, showing suppression of 3rd order intermodulation distortion in the order of -20 dBm compared to that of ... View full abstract»

• ### IEE Third One-Day Colloquium on Analog Signal Processing (Ref. No.1996/236)

Publication Year: 1996
| | PDF (84 KB)

The following topics were dealt with: analogue circuit techniques; analogue field arrays; analogue computing and synthesis; and analogue re-design View full abstract»

• ### CCII/CFA active-RC oscillators based on cascaded first-order allpass building blocks

Publication Year: 1996, Page(s):1/1 - 1/6
| | PDF (348 KB)

In this paper, the general theory of oscillators based on two cascaded first-order allpass networks is developed. As design pointers to the relative merits of single- and dual-element frequency control, frequency stability and harmonic rejection factors are evaluated as functions of the ratio of the time constants in the two allpass sections. Two new oscillators are then described. One of these us... View full abstract»

• ### Active tuning of crystal oscillators

Publication Year: 1996, Page(s):2/1 - 2/6
| | PDF (440 KB)

In this paper four systematic methods are described for the active tuning of crystal oscillators. The four methods are compared with respect to power consumption and maximum attainable carrier-to-noise ratio. It is concluded that the parallel resonance mode has to be preferred for active on-chip crystal tuning View full abstract»

• ### General multiple loop feedback OTA-C filter architectures

Publication Year: 1996, Page(s):3/1 - 3/6
| | PDF (408 KB)

Two design methods for the realization of arbitrary filter transmission zeros are presented. Universal models and equations are given. Explicit design formulae for two general cases are derived which prove extremely simple. The filter circuits generated are comprehensive in function. Both canonical and noncanonical structures can be obtained. All the configurations use only grounded capacitors and... View full abstract»

• ### Point feedback

Publication Year: 1996, Page(s):4/1 - 4/5
| | PDF (324 KB)

Point feedback is a system which measures the output distortion of a waveform and uses this measurement to provide a correcting input. Another way of looking at its operation is to regard it as being a circuit which provides a negative resistance. The precise circuit is described but two circuits are at the root of point feedback. The first is the authors error addon' of 1973 (later called error... View full abstract»

• ### Novel Palmo analogue signal processing IC design techniques

Publication Year: 1996, Page(s):5/1 - 5/6
Cited by:  Papers (4)
| | PDF (396 KB)

Introduces and analyses a novel technique for implementing programmable analogue hardware. Novel programmable Palmo circuits have been introduced which have low switching noise, low THD, and may be configured to perform many signal processing functions. An initial test chip has demonstrated the viability of the approach and aided in understanding the practical application of the technique. This ha... View full abstract»

• ### A field programmable, current mode, analog VLSI

Publication Year: 1996, Page(s):6/1 - 6/6
| | PDF (240 KB)

This work describes the architecture of a reconfigurable VLSI device which can be programmed to perform a wide range of analog signal processing functions. The device is to be constructed using a standard, single-well, CMOS process with the facility for construction of linear, parallel plate capacitors. The device operates in continuous time and therefore requires no sampling clock. It implements ... View full abstract»