Fluke 5700A Series Service Manual page 69

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
Theory of Operation
Introduction
2
2-3