RF-Sampling Frequency Planner, Analog Filter, and DDC Excel™ Calculator

(ACTIVE) FREQ-DDC-FILTER-CALC

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Technical Documents

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FREQ-DDC-FILTER-CALC:
RF-Sampling Frequency Planner, Analog Filter, and DDC Calculator

ACTIVE 1.1017  19-OCT-2017 

Description

This Excel calculator provides system designers a way to simplify the design and debugging of direct RF-sampling receivers. It offers three functions: frequency planning, analog filtering, and decimation filter spur location.

In the concept phase, a frequency-planning tool enables fine tuning of both the ADC sampling rate and input-frequency location in order to optimize the spurious-free dynamic range (SFDR) during a blocking event. Some designs have flexibility on both; others, such as a L-band receiver or a wireless infrastructure base station, deal with fixed-frequency bands and only offer sampling-rate tuning.

The external RF filter response is highly dependent on both the system SFDR targets and the SFDR performance of the ADC itself; an analog filter tool can help there during the design phase.

A decimation filter spur locator tool helps in situations where unwanted spurs in the fast Fourier transform (FFT) spectrum occur during system bring-up. When the ADC outputs the entire Nyquist zone, it is simple to determine the original frequency, but not necessarily the source of the spur. However, once digital decimation with complex mixing comes into play and only a partial FFT spectrum (into which the spurs are folded) is available, this simple tool maps original spurs of the ADC to their new locations.

Features
  • Frequency planning
  • Analog filtering
  • Decimation filter spur location


Technical Documents
Application notes (1)
Title Abstract Type Size (KB) Date Views
PDF 1198 04 Jan 2018 1,276

TI Devices (14)

Part Number Name Product Family
ADC08DJ3200  8-Bit, Dual 3.2-GSPS or Single 6.4-GSPS, RF-Sampling Analog-to-Digital Converter (ADC)  Analog-to-Digital Converters (ADCs) 
ADC12DJ2700  12-Bit, Dual 2.7-GSPS or Single 5.4-GSPS, RF-Sampling Analog-to-Digital Converter (ADC)  Analog-to-Digital Converters (ADCs) 
ADC12DJ3200  12-Bit, Dual 3.2-GSPS or Single 6.4-GSPS, RF-Sampling Analog-to-Digital Converter (ADC)  Analog-to-Digital Converters (ADCs) 
ADC12DL3200  12-Bit, Dual 3.2-GSPS or Single 6.4-GSPS, RF-Sampling Analog-to-Digital Converter (LVDS Interface)  Analog-to-Digital Converters (ADCs) 
ADC12J1600  12-Bit, 1.6-GSPS, RF Sampling Analog-to-Digital Converter (ADC)  Analog-to-Digital Converters (ADCs) 
ADC12J2700  12-Bit, 2.7-GSPS, RF Sampling Analog-to-Digital Converter (ADC)  Analog-to-Digital Converters (ADCs) 
ADC12J4000  12-Bit, 4.0-GSPS, RF Sampling Analog-to-Digital Converter (ADC)  Analog-to-Digital Converters (ADCs) 
ADC31RF80  14-Bit, 3-GSPS, RF-Sampling Wideband Receiver and Feedback IC  RF & Microwave 
ADC32RF42  Dual-Channel, 14-Bit, 1.5-GSPS RF-Sampling Analog-to-Digital Converter (ADC)  Analog-to-Digital Converters (ADCs) 
ADC32RF44  Dual-Channel, 14-Bit, 2.6-GSPS RF-Sampling Analog-to-Digital Converter (ADC)  Analog-to-Digital Converters (ADCs) 
ADC32RF45  Dual-Channel, 14-Bit, 3-GSPS RF-Sampling Analog-to-Digital Converter (ADC)  Analog-to-Digital Converters (ADCs) 
ADC32RF80  Dual-Channel, 14-Bit, 3-GSPS, RF-Sampling Wideband Receiver and Feedback IC  RF & Microwave 
ADC32RF82  Dual-Channel, 14-Bit, 2.45GSPS, RF-Sampling Telecom Receiver and Feedback IC  RF & Microwave 
ADC32RF83  Dual-Channel, 14-Bit, 3-GSPS, RF Sampling Wideband Receiver and Feed  RF & Microwave 

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