Low Noise DC Voltage Source LP6016-01/LP6016-01P

Bias-voltage and control-voltage source for sensors and devices

lp6016_01

¡¶ LP6016-01

lp6016_01

LP6016-01/LP6016-01P is a low voltage DC voltage source equipped with LAN/USB/RS-232 interface.
The output noise voltage is extremely small with a maximum of 10 £gVrms, and the temperature stability of the output is excellent at less than ¡Ó10 ppm/¢XC.
It can be used as a DC bias source for photodiodes and a control voltage source for crystal oscillators.
Please refer to "
Applications" page for further information.

2U,Half-rack size

Output Noise: 10 £gVrms Bandwidth 10 Hz to 20 MHz

Output Voltage Stability: ¡Ó10 ppm/¢XC typical

Output voltage:
LP6016-01: 0 to +16.1 V (Positive), 0 to -16.1 V (Negative)
  Positive and negative settings can be selected from tracking mode or
  independent mode.
LP6016-01P: 0 to +16.1 V (Dual Voltage Output / V1, V2)
  V1 and V2 settings can be selected from tracking mode or
  independent mode.
Setting resolution: 500 £gV
*
Setting accuracy: ¡Ó(0.03% +250 £gV)
*

Maximum current: 100 mA

Interface: USB, RS-232, LAN

*Modifications of setting resolution and accuracy are available upon requests prior to placing your orders.
Please don¡¦t hesitate to ask for details and pricings.
Modification example,
   Setting Resolution: 100 µV
   Setting Accuracy: ¡Ó(0.03% +75 µV)

front/rear


graph01

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Applications

Improved Stability of Voltage Controlled Crystal Oscillator

Phase noise, frequency accuracy and frequency stability are normally measured during performance evaluation for crystal oscillators¡¦ high performance voltage controlled devices such as VCXO, TCXO and OCXO, they are typically susceptible by noise and stability of their control voltage.

*VCXO (Voltage Controlled Crystal Oscillator), TCXO (Temperature Compensated Crystal Oscillator), OCXO (Oven Controlled Crystal Oscillator)

VCXO frequency measurement---different control voltage sources

A low noise and stable control voltage source is used to evaluate voltage control devices.
In the block diagram below, the output noise was measured with a general linear power supply or LP6016-01 as the control voltage source.

Measurement Conditions

¡P         - TCVCXO Center Frequency: approx. 30 MHz;

¡P         - Measurement Cycle: 1 Hz;

¡P         - Number of Measurements: 40,000 times;

¡P         - Total Measurement Time: approx. 11 hours;

¡P         - Ambient Temperature: 23 ¡Ó5¢XC.

The upper part of the graph is the time change of the output frequency. When the LP series is used, the output frequency is stable for a long time.

The bottom part of the graph is a histogram display of the output frequency. The deviation from the center frequency is way smaller with our LP Series.

As we can see, the LP series is able to supply a stable voltage for a long time. A stable control voltage source is required to evaluate not only crystal oscillators but also voltage control components.

Measurement Block Diagram

Dual-channel of positive voltage are used for control voltage and power supply.


Reference voltage source for A/D converter

The reference voltage of the A/D converter affects the conversion accuracy, and the voltage noise and fluctuations are related to output performance. A low noise and stable voltage source is required for performance testing of A/D converters.

Output voltage of A/D converter---Difference between control voltage sources

In the block diagram below, the output voltage was measured when two different voltage sources were used, while the A/D converter reference voltage is at 4.096V and the input voltage is at 2.5V (≈ full scale).

Measurement Conditions

The output voltage is applied 80 million times in 80 minutes, and the variation is displayed in a histogram.

When the LP series is used, the variation in the LSB of the AD converter was reduced.

Measurement Block Diagram

Dual-channel of positive voltage are used for control voltage and power supply.


Improvement of S/N Ratio of Photodiode Output

When using a highly sensitive sensor, the noise of from its power source would affect the sensor's sensitivity. With different bias power sources applied to the photodiode, the output S/N ratios are compared below.

Video : 

Photodiodes are widely used as light receiving elements for lasers, and in order to increase its sensitivity, a reverse bias voltage (Vb) is applied. A low-noise bias voltage source is required for sensitive photodetection.

Detection Signal Comparison---Difference Between Drive Power Supply and Bias Voltage Source

The detection signals were compared between the drive power supply (constant current control) and the bias voltage source using LP6016-01 or a general linear power supply.

Measurement Block Diagram

The positive voltage is used as the drive power supply and the negative voltage is used as the reverse bias power supply.