By Topic

IEE Colloquium on Analog Signal Processing (Ref. No. 1998/472)

28 Oct 1998

Filter Results

Displaying Results 1 - 13 of 13
  • Developments in linear and nonlinear FET circuit design using derivative superposition

    Publication Year: 1998, Page(s):1/1 - 110
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (920 KB)

    This paper describes a number of emerging results pertaining to a circuit design technique called derivative superposition. A number of different approaches to designing both linear and nonlinear circuits with derivative superposition are described. Limitations of currently available CAD models are identified. The measured performance of a 100 mW power amplifier, a broadband frequency doubler and ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ladder derived switched-current decimators

    Publication Year: 1998, Page(s):5/1 - 5/9
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (404 KB)

    A bilinear-transformed, elliptic switched-current decimator based on a combination of polyphase networks and a low sensitivity ladder structure has been demonstrated with an M=2 fold reduction in sampling rate. Settling time for the memory cells is maximised by the use of polyphase FIR networks and operating the prototype filter within the decimator at the lower sampling rate. The proposed FIR-IIR... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • IEE Colloquium Analog Signal Processing (Ref. No.1998/472)

    Publication Year: 1998
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (156 KB)

    The following topics were dealt with: analog circuit design; amplifiers and filters; switched-current techniques; communication circuits View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design of an RF transceiver

    Publication Year: 1998, Page(s):12/1 - 12/6
    Cited by:  Patents (17)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (352 KB)

    As cellular technology matures, there is an ever increasing demand for greater integration of functions within the handset. Constantly the market demands smaller radio subsystems, incorporating fewer ICs, with lower power consumption and improved RF performance. Many silicon vendors offer radio chipsets with varying levels of integration. This paper describes the BRIGHT RF ICs which are highly int... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Switched-current techniques under pressure: high order and wideband filter design

    Publication Year: 1998, Page(s):4/1 - 411
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (552 KB)

    Fully-balanced switched-current Euler integrators featuring S2I cells and common-mode rejection within the circuit have been utilised in the efficient realisation of modified SI ladder filters with simplified input arrangements for savings on component count. Using prototype ladder manipulation, quite remarkable reductions in spreads and total gm were achieved for the 21st order ellipti... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The K-model: RF IC modelling for communication systems simulation

    Publication Year: 1998, Page(s):11/1 - 11/8
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (560 KB)

    A new technique for modelling the entire analogue front-end of an RF IC for fast simulation and analysis in a DSP design environment is described. The designer's objective is to see if an existing analogue front-end circuit design will work in the target end-to-end system before the RF IC is fabricated. Accurate full system simulation might save the need for chip redesign, mask generation and refa... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Filters from L-band to X-band using GaAs technology

    Publication Year: 1998, Page(s):3/1 - 310
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (788 KB)

    Microwave filters are essential components in communication systems and their successful integration will yield benefits in the form of reduced size, weight and cost. Although GaAs has some disadvantages compared with silicon, such as higher FET output conductance, frequency dispersion and higher cost, there have been attempts to exploit the high bandwidth of GaAs MESFETs to realise high frequency... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Towards a fully implantable analogue cochlear prosthesis

    Publication Year: 1998, Page(s):10/1 - 1011
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (500 KB)

    This paper addresses the feasibility of a completely new design of cochlear prostheses replacing all digital signal processing by an analogue signal processor. The new design is based upon CMOS-VLSI transistors operating in weak inversion and in micro-power mode. Lowpass and bandpass filters are designed using the recently proposed log-domain technique. The proposed analogue system is smaller and ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multi-channel matching in CMOS filters

    Publication Year: 1998, Page(s):2/1 - 2/6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (420 KB)

    This paper describes two chips designed respectively for narrow and wide band filter applications in the frequency range 1 kHz-100 kHz. The designs are general purpose, in that the resistor and capacitor values may be adjusted, through mask changes. The filters have been demonstrated on a 1.2 micron foundry CMOS process. A key element of the designs was in provision of channel to channel matching ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Broadband CMOS operational amplifier design

    Publication Year: 1998, Page(s):6/1 - 6/6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (452 KB)

    This paper describes a voltage mode operational amplifier with >90 MHz unity gain bandwidth, low offset, on-chip stabilisation and a Class-AB output stage. The devices have been designed in to several chips, in one case with 20 examples on a single chip. Test results on an evaluation circuit are reported here View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Bootstrapping techniques to improve the bandwidth of transimpedance amplifiers

    Publication Year: 1998, Page(s):7/1 - 7/6
    Cited by:  Papers (6)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (364 KB)

    Transimpedance amplifiers using voltage feedback operational amplifiers are widely used for current to voltage conversion in applications when a moderate/high bandwidth and a high sensitivity are required, such as photodiodes, photomultipliers, electron multipliers and capacitive sensors. The conventional circuit presents a virtual earth to the input and at low frequencies, the input capacitance i... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Low noise, high linearity Gilbert cell transconductor

    Publication Year: 1998, Page(s):8/1 - 815
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (552 KB)

    This paper describes techniques to reduce the effects of parasitic emitter resistance in the Gilbert current gain-cell. The technique is further developed to be employed in a Gilbert cell transconductor (GCT), which offers improved characteristics in terms of linearity and noise performance over the conventional GCT. The deliberate addition of resistors to the gain-cell offers a better noise perfo... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Novel current-feedback operational amplifier design based on a floating circuit technique

    Publication Year: 1998, Page(s):9/1 - 9/4
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (172 KB)

    The conventional current-feedback op-amp (CFOA) exhibits high speed and high bandwidth but has relatively poor common-mode rejection ratio (CMRR) and poor DC offset and low frequency gain accuracy. Several design techniques improving the DC performance have been published. The proposed technique presented in this paper is to bootstrap the input stage with the input signal. By using this technique,... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.