Complementary Waveform Generator Example
This page is a step-by-step example which uses the Complementary Waveform Generator (CWG).
This example uses the Numerically Controlled Oscillator (NCO) output signal (running at 50% duty cycle) as the input and the High-Frequency Internal Oscillator (HFINTOSC) as a clock.
This example also produces two complementary outputs and uses an external switch as the shutdown control, as shown in the accompanying block diagram below.
CWG Example Setup
4. The CWGFLT1 pin is enabled as a shutdown signal which is connected to a normally open momentary switch. When the switch is pressed, a low signal appears on the CWGFLT1 pin and triggers the shutdown.
6. Both outputs are set to drive to their respective inactive mode when the shutdown signal occurs.
7. The CWG outputs are connected to the I/O pins and the output polarity is set to normal mode.
8. The CWG is then enabled. For reference, the NCO setup code is also shown that produces the input signal.
CWG Example Operation
The CWG example is running and the screen capture below shows the results.
The NCO signal can be seen at the top of the screen capture along with the CWGA and CWGB signals. You can also see the dead-band delays that are triggered by the edges of the NCO input signal.
The CWG is forced into shutdown mode.
When the momentary switch is pressed, the CWG outputs are driven to their inactive state showing the shutdown has occurred.
