Tektronix AWG2005 Theory of Operation, Clock Oscillator (A1 Clock Board), Clock Sweep Oscillator (A31 Clock Sweep Board), Sequencer (A2 AWG Board)

Theory of Operation

This section describes the basic operation of the major circuit blocks or modules in the AWG2005. Section 9, Diagrams, includes two block dia5 grams and an interconnect diagram. Figure 951 shows the modules and functional blocks of the AWG2005 with Option 02, 04, 05 and 09 installed. Figure 952 shows how the modules interconnect.

Module Overview	The module overview describes the basic operation of each functional circuit
	block.
	The AWG2005 Arbitrary Waveform Generator is a portable, two5 or four5
	channel instrument. For each channel, the AWG2005 reads the digital wave5
	form data loaded into its waveform memory. The point rate clock determines
	the rate at which the data is read. The AWG2005 converts the data from
	digital to analog format and outputs the resulting arbitrary waveform.
	Clock Oscillator (A1 Clock Board)
	The clock circuit is a PLL oscillator that uses a 12.8 MHz reference crystal. It
	supplies a point rate clock that is adjustable from 20 MHz to 0.01 Hz for
	reading data from channel waveform memory.
	When an external clock source is selected, the external clock signal is
	passed directly through to the Clock board and used for reading waveform
	data in memory.
	Clock Sweep Oscillator (A31 Clock Sweep Board)
	In addition to the description for the Clock Sweep Oscillator, it provides the
	clock sweep from 20 MHz to 0.03 Hz.
	Sequencer (A2 AWG Board)
	This sequencer block controls the waveform memory addresses read out
	according to the contents of a sequence file.
	Waveform Memory (A2 AWG Board)
	This functional block contains the memory that holds the waveform digital
	data. There are 12 bits for waveform data and one bit for waveform markers
	(for each channel).

AWG2005 Service Manual 3￿1