Hi all,

i hope someone can shed some lights, for following request:

+I have designed and fabricated a transimpedance amplifier (TIA) IC chipand need to measure the input referred noise current spectral density(unit: pA/square_root_Hz).+

May i know whats the best method and equipment to achieve this? my first thought would be network analyzer.

i hope someone can shed some lights, for following request:

+I have designed and fabricated a transimpedance amplifier (TIA) IC chipand need to measure the input referred noise current spectral density(unit: pA/square_root_Hz).+

May i know whats the best method and equipment to achieve this? my first thought would be network analyzer.

*Noise Power Parameters:*

----------------

*_SYSNPD / SYSNPDI_* - System Noise Power Density: Total noise power available at the ADC, including the noise contributed by both the DUT and the internal noise receiver. This is generally expressed as an absolute power measurement in dBm, but can also be expressed in Watts or Kelvin.

dBm = 10 log10(k * T * B * 1000)

where:

k = Boltzmann's constant

T = the measured noise temperature

B = bandwidth

1000 = conversion from milliwatts

*_SYSRNP / SYSRNP_*I - System Relative Noise Power: The noise temperature of the combined DUT and receiver relative to 290 Kelvin. This is generally reported as a ratio in dB. Therefore a perfectly quiet device would render a trace at 0 dB.

dB = 10 log10(T/290)

*_DUTNPD / DUTNPDI_* - DUT Noise Power Density: When correction is ON, this trace exhibits the available noise power, best described as the maximum power available from the DUT where the impedance of the noise port is equal to the output match of the DUT. To be more precise, this occurs when the noise port match is equal to the conjugate of the output match of the DUT. The noise power contributed by the receiver is removed.

When correction is OFF, the trace exhibits what is more accurately described as delivered power. Delivered power is the power actually seen by the ADC. Any mismatch between the receiver and the DUT is ignored. The noise power contributed by the receiver is removed.

This measurement is generally expressed in dBm:

dBm = 10 log10( (DUT Temperature - Receiver Temperature) * B * 1000)

where:

B = bandwidth

1000 = conversion from milliwatts

*_DUTRNP / DUTRNPI_* - DUT Relative Noise Power: This measurement is rendered as a ratio of the DUT temperature to 290 Kelvin. It is generally expressed in dB. The same comments apply with respect to available versus delivered power as described above for DUTNPD.

dB = 10 log10 (DUT Temperature - Receiver Temperature)

----------------------

If you provide more information about your device (gain, expected noise figure, ...) we can help you decide which noise figure option (028 or 029) is appropriate for your application.