ADL5315ACPZ-R7 datasheet(15/20 Pages) AD

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ADL5315

Rev. 0 | Page 15 of 20

RINPUT

FET BUFFER

VECTOR SIGNAL

ANALYZER

HP89410A

ADL5315

VPOS

SREF

VSET

+12V

–12V

INPT

IOUT

RLOAD

2.2nF

LNA

1.5V

–

1.5V

–

1.5V

–

Figure 31. Configuration for Noise Spectral Density and Wideband Current Noise

Figure 32 shows the configuration used to measure the pulse

response of IINPT to IOUT. To create the test current pulse, Q1 is

used in a common base configuration with the Agilent 33250A

pulse generator. The output of the 33250A is a negative biased

square wave with an amplitude that results in a one decade

current step at IOUT.

RC is chosen according to what current range is desired. For

30 μA and lower, the AD8067 FET input op amp is used in a

transimpedance amplifier configuration to allow for viewing on

the TDS5104 oscilloscope. For signals greater than 30 μA, the

ADA4899-1 replaced the AD8067 to avoid limiting the

bandwidth of the ADL5315.

The configuration in Figure 33 is used to measure VINPT while

VSET is pulsed. Q1 and RC are used to generate the operating

current on the INPT pin. An Agilent 33250A pulse generator is

used on the VSET pin to create a 0.0 V to 4.0 V square wave.

The setup in Figure 34 was used to measure the small signal ac

response from IINPT to IOUT. The AD8138 differential amplifier

was used to couple the ac and dc signals together. The ac signal

was modulated to a depth of 5% of full scale over frequency.

The voltage across RF sets the dc operating point of IINPT. The

values of RF are chosen to result in decade changes in IINPT. The

ADA4899-1 op amp is used as a transimpedance amplifier for

all current conditions.

TDS5104

OSCILLOSCOPE

ADL5315

EVALUATION BOARD

INPT

VPOS VSET SREF COMM

IOUT

DC SUPPLIES/DMM

AGILENT 33250A

PULSE GENERATOR

Figure 32. Configuration for Pulse Response of IINPT to IOUT

TDS5104

OSCILLOSCOPE

ADL5315

EVALUATION BOARD

VPOS

SREF

COMM

IOUT

DC SUPPLIES/DMM

INPT

VSET

AGILENT 33250A

PULSE GENERATOR

KEITHLEY 236

Figure 33. Configuration for Pulse Response from VSET to VINPT

NETWORK ANALYZER

OUTPUT

POWER

SPLITTER

AD8138

EVAL BOARD

––

ADL5315

EVALUATION BOARD

INPT

IOUT

VPOS VSET SREF COMM

DC SUPPLIES/DMM

Figure 34. Configuration for Small-Signal AC Response

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