Filter tuning using direct digital sub-sampling

Details Filter tuning using direct digital sub-sampling Filter tuning using direct digital sub-sampling

H - Electricity

03

J

H03J 3/04 (2006.01) H03H 11/12 (2006.01) H03H 21/00 (2006.01)

Patent

CA 2357491

A Method for filter tuning using direct digital sub-sampling is taught herein. The tuning is accomplished in the digital domain by determining the filter characteristics from the shape of the transfer function. The input signal (1) is passed through the filter (3) and is then sub-sampled by and Analog to Digital Converter (ADC) (5). The sub-sampled signal (6) is then processed in the digital domain using a digital circuit (7) that is used to determine the center frequency (Fc) and Quality factor (Q) and/or other important filter parameters. The Fc, Q and/or other important filter parameters are then adjusted by generating digital control signals (8) that can be converted to analog signals (10) using Digital to Analog Converters (DACs) (9). This is a form of direct tuning as the filter itself is tuned without the use of a master filter or Voltage Controlled Oscillator (VCO). The tuning of the filter requires the digitization of the filter output (4). The filter amplifies and shapes the input signal and noise to the filter transfer function. To facilitate tuning, the input signal may be attenuated during the tuning cycle. This can be accomplished by lowering the AMPlifier (2) gain and/or using an input switch that provides isolation between the input signal and the filter. The resulting frequency shaping by the filter may be amplified during tuning to give sufficient Signal to Noise Ration (SNR) in the ADC so that the shape can be resolved in the digital circuit.

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