Adder Circuits
Last Updated on: Wednesday, April 30, 2008 03:13 PM

AN-578: RMS Calculations for Energy Meter Applications using the ADE7756:  AN-578 - Analog Devices Application Notes  (app note added 2/06)  The document describes the implementation of an rms signal processing algorithm using the ADE7756 and a Microcontroller (PIC16C63)   from Microchip.

AN-626: Using the AD7732/AD7734/AD7738/AD7739 Checksum Register:  AN-626 - Analog Devices Application Notes  (app note added 2/06)

High Input Impedance DC Summing Amplifier:  Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc.  (app note added 2/06)

High Input Impedance Precision DC Summing Amplifier:  Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc.  (app note added 3/06)

Low Voltage High Input Impedance Precision DC Summing Amplifier:  Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc.  (app note added 2/06)

LX1741/1742 Formula Calculator for AN22:  MicroNote 1310 from Microsem  (app note added 3/06)

Model Fixed Point DSP Arithmetic in C:  03/18/99 EDN-Design Ideas / (Schematic / circuit added 10/05) You can run initial high-level simulations of custom numerical algorithms, such as digital filters, using floating-point numbers in an environment such as C or Matlab. Unfortunately, you won't see include fixed-point effects, such as truncation due to limited precision and register overflow, until you use a Hardware Design Language (HDL), such as Verilog or VHDL. However, a technique that models these effects in C—the function "bit_limit" in Listing 1—provides faster execution and better portability than HDLs and allows early exploration of the trade-off between bus width and performance.

MW Active Antenna:  This circuit is designed to amplify the input from a telescopic whip antenna. The preamplifier is designed to cover the medium waveband from about 550Khz to 1650Khz. The tuning voltage required is 1 to 12 volts and can be obtained from a 10k potentiometer connected to the 12 Volt power supply. RV1 is the gain control allowing weak signals to be amplified or strong signals to be attenuated. The control voltage is applied to gate 2 of TR1, a dual-gate MOSFET, the signal voltage applied via gate 1; the input signal being tuned via L1 and the two varicap diodes at the MOSFET's input and also by L2 and the varicaps at the MOSFET's drain terminal. Both tuned circuits provide high selectivity across the entire tuning range. To aid stability the MOSFET....    (added 10/05)

OA-26: OA-26 Designing Active High Speed Filters:  National Semiconductor - Application Note (app note added 2/06)

Regenerating the DS1847 / DS1848 Resistor Calibration Constants:  Maxim Application Notes / 1921 / Jun-08  (app note added 3/06)

Resistor Calculator :  Luxeon Application Note (app note added 3/06)

RISC µP Implements Fast FIR Filter:  01/21/99 EDN-Design Ideas / (Schematic / circuit added 10/05)  When it comes to implementing a fast FIR filter, current RISC µPs can compete with DSP µPs. The FIR algorithm continuously implements the following equation:  N=n–1    Out=Sum[in(t[-]n)coeff(n)]  N=0,....

Subwoofer Equalizer:  The Linkwitz transform circuit is a hugely flexible way to equalize the bottom end of a sealed loudspeaker enclosure. A speaker that is corrected using this method is flat from below resonance to the upper limit of the selected driver. The low frequency roll off point is determined by the parameters of the transform circuit. Should the enclosure size be too small and cause a lump in the response before roll off, this is also corrected. A conventional active crossover network is then used to divide the subwoofer signal from the main channel signals. Note that there is also a separate spreadsheet calculator available for calculating component values for different situations not handled by the original circuit. (Electronic Circuit added 03/06)

TV/Radio Antenna Cable galvanic isolator:  (electronic circuit added 8/03)

Using the AD7732/AD7734/AD7738/AD7739 Checksum Register:  AN-626 - Analog Devices Application Notes  (app note added 2/06)

Video Emitter uses Battery Power:  08/30/01 EDN Design Ideas  /  (added 12/04)  The block diagram in Figure 1 shows how to make a cable-free, direct-video system. The system allows users to walk from booth to booth at an exhibition to interview people and to display the interviews in real time on three screens at key locations. You can use the small and simple system each time you need to capture image and sound on the run. ...