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Continuous Wave Doppler Processor (cw) - Philips HDI 4000 Service Manual

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4730-0037-02
HDI 4000 Field Service Manual
Continuous
Wave Doppler
Processor (CW)
Figure 4-7
is a functional diagram of the CW PCB.The CW PCB functions that support static
CW and steered CW are:
Static CW
CW pulser to drive scanhead transducer
RF pre-amplifier to receive signal
Mixer to change from RX signal to baseband signal with 50 kHz range of right-angle phase
(0 and 90 degrees)
Thump filter (200/2 kHz)
Variable Wall filter (Min. 200 Hz)
Variable gain
Variable lowpass filter with 1 kHz resolution for noise bandwidth performance
16-bit analog-to-digital converters
Steered CW
16-channel CW pulser to drive scanhead transducer
16-channel RF pre-amplifier for receiving signal
TX/RX Beamformer for focusing when transmitting and receiving
Mixer for basebend with 50 kHz range of right-angle phase (0 and 90 degrees)
Thump filter (200/2 kHz)
Variable Wall filter (Min. 200 Hz)
Variable gain
Variable lowpass filter with 1 kHz resolution for noise bandwidth performance
16-bit analog-to-digital converters
Theory of Operation: Functional Description
Page 58

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