WM2130B

The WM2130B is a 256 point programmable transversal filter circuit constructed using charge coupled device techniques. A sampled input signal is stored in a tapped CCD delay line and each sample multiplied by a corresponding reference value held in an analogue reference store.The multiplicands are added by current summing to give the correlationbetween signal and reference. Multiplication is achieved in a single transistor by time multiplexing the signal with a signal zero level. This methos gives high accuracy and low noise. A linearisation circuit at the input to the CCD delay line has been used to ensure good linearity and also to give a unity through gain to simplify cascading in applications where a longer filter is required.

Features of the WM2130B can be summarized as:(1)up to 150 kHz clock rate; (2)15 volt operation; (3)input linearisation-ensure linear response over wide dynamic range(60 dB); (4)low power-typically 250 mW; (5)easily cascaded to make longer filters. Applications of the WM2130 can be summarized as:(1)sonar signal processing; (2)matched filtering; (3)extraction of coherent signals from noise; (4)equalisation techniques for communications systems; (5)discrete fourier transforms

The absolute ratings of the WM2130B can be summarized as:(1): storage temperature is -65 to +100; (2): maximum positive voltage on any pin W.r.t VBB is +25 V; (3): maximum negative voltage on any pin w.r.t VBB is -0.3 V; (4): maximum positive voltage on VDD w.r.tVss is +19 V.The normal operating characteristics of the WM2130 can be summarized as:(1): VDD is 14.5 V min, 15 V typ and 15.5 V max; (2): VBB is -6 V min, -5 V typ and -4 V max; (3): clocks high is 14.5 V min, 15 V typ and 15.5 V max; (4): clocks low is -1 V min, 0 V typ and 1 V max; (5): reference clock frequency is 1 Hz min and 5M Hz max; (6): signal clock frequency is 200 Hz min and 150k Hz max; (7): signal offset is 6 vots typ; (8): signal amplitude is 1.5 V p-p max; (9): reference offset is 7.5 V max; (10): reference amplitude is 3 volts p-p max.