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BPSK Subsystem

The BPSK subsystem allows you to modulate a wave form with Binary Phase Shift Keying (BPSK), a digital modulation

format. In BPSK, the carrier waveform is phase shifted between two phase settings using an on/off keying. The source

may be internal, using a square wave at a specified frequency, or external, using the external trigger input.

Example

To generate a BPSK waveform:

1. Configure carrier waveform: Use FUNCtion, FREQuency, VOLTage, and VOLTage:OFFSet to specify the carrier

waveform's function, frequency, amplitude, and offset.

2. Select modulation source (internal, external, CH1, or CH2): BPSK:SOURce. For an external source, skip

steps 3 and 4 below.

3. Select BPSK phase:BPSK[:PHASe]

4. Set BPSK rate:BPSK:INTernal:RATE

5. Enable BPSK Modulation:BPSK:STATe ON

[SOURce[1|2]:]BPSK:INTernal:RATE {<modulating_frequency>|MI-

Nimum|MAXimum}

[SOURce[1|2]:]BPSK:INTernal:RATE? [{MINimum|MAXimum}]

Sets the rate at which the output phase "shifts" between the carrier and offset phase.

Parameter Typical Return

1 mHZ to 1 MHz, default 10 Hz +1.000000000000000E-03

Set BPSK rate to 10 kHz:

BPSK:INT:RATE MIN

l The BPSK rate is used only when the INTernal source is selected (BPSK:SOURce INTernal) and is ignored when the

EXTernal source is selected (BPSK:SOURce EXTernal).

l The internal modulating waveform is a square wave with a 50% duty cycle.

[SOURce[1|2]:]BPSK[:PHASe] {<angle>|MI-

Nimum|MAXimum}[SOURce[1|2]:]BPSK[:PHASe]? [{MINimum|MAXimum}]

Sets the Binary Phase Shift Keying phase shift in degrees.

Parameter Typical Return

-360 to +360 degrees, default 180 +0.000000000000000E-00

Set phase shift to 90 degrees:

BPSK:PHAS 90

172 Agilent 33500 Series Operating and Service Guide

Agilent Technologies Agilent 33500 Series User Manual

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