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Theory of Operation
Introduction
2
2-3
2-98. Internal CAL Zero Amplifier....................................................... 2-59
2-99. Switch Matrix 5725A Amplifier Interface .................................. 2-61
2-100. DAC Assembly (A11)...................................................................... 2-61
2-101. Basic DAC Theory of Operation................................................. 2-61
2-102. DAC Assembly Digital Control................................................... 2-64
2-103. DAC Assembly Reference Circuitry ........................................... 2-64
2-104. Duty-Cycle Control Circuit ......................................................... 2-65
2-105. DAC Filter Circuit....................................................................... 2-66
2-106. DAC Output Stage....................................................................... 2-66
2-107. Sense Current Cancellation Circuit ............................................. 2-67
2-108. Linearity Control Circuit ............................................................. 2-67
2-109. Negative Offset Circuit................................................................ 2-68
2-110. DAC Output Switching................................................................ 2-68
2-111. DAC Buffered Reference Sip...................................................... 2-68
2-112. Calibration Hardware .................................................................. 2-69
2-113. ADC Amplifier............................................................................ 2-69
2-114. ADC Input Selection.................................................................... 2-69
2-115. ADC Circuit................................................................................. 2-70
2-116. How the DAC is Used in Calibration .......................................... 2-72
2-117. DAC Assembly Calibration......................................................... 2-72
2-118. Oscillator Section Overview............................................................ 2-73
2-119. Oscillator Control Assembly (A12)................................................. 2-73
2-120. Oscillator Control Digital Control............................................... 2-74
2-121. Oscillator Input Switching........................................................... 2-74
2-122. Sense Current Cancellation ......................................................... 2-74
2-123. Averaging Converter.................................................................... 2-75
2-124. Error Integrator............................................................................ 2-75
2-125. Three-Pole Filter.......................................................................... 2-75
2-126. Analog Amplitude Control Loop................................................. 2-75
2-127. AC/DC Thermal Transfer Circuit................................................ 2-77
2-128. Oscillator Calibration .................................................................. 2-79
2-129. AC/DC Frequency Response Characterization ........................... 2-80
2-130. Oscillator Output Assembly (A13) .................................................. 2-80
2-131. Oscillator Output Digital Control................................................ 2-82
2-132. Quadrature RC Oscillator............................................................ 2-82
2-133. Oscillator Amplitude Control...................................................... 2-83
2-134. Phase−locked Loop...................................................................... 2-83
2-135. 2.2V and 22V Range Output Amplifier....................................... 2-84
2-136. Oscillator Wideband Smd Assembly (A13A1) ........................... 2-84
2-137. Output Stage ................................................................................ 2-85
2-138. Phase Shifter................................................................................ 2-85
2-139. Power Amplifier Assembly (A16) ................................................... 2-85
2-140. Power Amplifier Digital Control Sip Assembly (A16A1) .......... 2-86
2-141. PA Common Circuitry................................................................. 2-87
2-142. +PA and -PA Supplies................................................................. 2-87
2-143. PA Input Stage............................................................................. 2-87
2-144. PA Mid Stage............................................................................... 2-88
2-145. PA Output Stage .......................................................................... 2-88
2-146. PA Sense Current Cancellation Circuitry.................................... 2-89
2-147. PA in Standby.............................................................................. 2-89
2-148. PA Operation: 220V DC Range .................................................. 2-89
2-149. PA Operation: 220V AC Range .................................................. 2-91
2-150. High Voltage Assembly Support Mode....................................... 2-91
2-153. 220V DC Internal Calibration Network ...................................... 2-92
2-154. PA Calibration ............................................................................. 2-92