14-bit 80MSPS ADC for SDR experiments

Eric Brombaugh designed this ADC board for RF signals:

rxadc14.jpg

RXADC_14 Pmod

This is an ADC designed for use in digitizing RF signals with up to 40MHz bandwidth and 80dB SNR. The form-factor is compatible with a dual-connector Digilent Pmod so that it can be used with commonly available FPGA development boards to build a variety Software-Defined radio functions.

Features:

  • ADC14C105 14-bit 105MSPS RXADC.
  • Onboard 3.3V Regulator (5V input)
  • Filtered Analog 3.3V Supply
  • Onboard 80MHz clock oscillator
  • Digilent-compatible 2-connector Pmod interface
  • 50-ohm SMA input – 2.5Vpp ~= 0dBfs

emeb has shared the board on OSH Park:

14-bit 80MSPS ADC for SDR experiments

831aa0bd88f188310e6a04a187a105ae
Order from OSH Park

14-bit 80MSPS ADC for SDR experiments

Hall Sensor Preamp

Piotr Zapart designed this board to overcome range issues when using traditional 300 degree potentiometers or Hall sensors as rotational angle to voltage converters:

hpre4

HALL Preamp/Analog axis calibrator

The idea was to create a device that will perform an axis calibration, usually done in digital domain, but before sampling the signal in the ADC, still in analog domain, using it’s advantageous infinite resolution

 HappPre_operation.png

the main function of this device is to:

  • Buffer the analog output signal coming from a potentiometer or another rotary angle to voltage converter like ie. Hall sensors.
  • Filter out the high band noise and limit the bandwidth to an usable range only, protect the input against voltage spikes.
  • Match the output voltage range of the source (pot/hall sensor) with the input range of the ADC, thus making the most of the available ADC resolution.
  • Linearize the hall sensor output signal response by amplyfing it’s most linear region to the full scale ADC input range.

The board is shared on OSH Park:

HALL Preamp

hpre2.jpgOrder from OSH Park

Hall Sensor Preamp