Tunable Filters Using Charge Transfer Devices.
Interim rept. no. 3, 16 Jul 74-16 Mar 75,
TEXAS INSTRUMENTS INC DALLAS CENTRAL RESEARCH LABS
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An integrated CCD charge coupled device bandpass transversal filter has been designed. The CCD has 800 stages and is mask programmed to a tunable narrowband bandpass filter response with a 3 dB bandwidth of about 0.37 of center frequency. The tuning range is 50 Hz to 500 kHz. The self-contained device is designed for operational simplicity, requiring only dc voltages and one master clock in addition to the input and output signals. This report describes the design of the complete integrated circuit, which consists of the following sections 1 the CCD 2 a low noise, charge coupled input amplifier 3 a low noise, differential, charge coupled output amplifier 4 a clock waveform generator and 5 clock line drivers. An analysis of theoretical noise performance predicts a 76 dB dynamic range and a minimum input level of 30 microvolts.
- Electrical and Electronic Equipment