Complex Adder/Subtractor

Block: Complex Adder/Subtractor (complex_addsub)
Block Author: Aaron Parsons
Document Author: Ben Blackman

Contents

Summary
Mask Parameters
Ports
Description
- Usage

Summary

This block does a complex addition and subtraction of 2 complex numbers, a and b, and spits out 2 complex numbers, a+b and a-b.

Mask Parameters

Parameter	Variable	Description
Bit Width	BitWidth	The number of bits in its input.
Add Latency	add_latency	The latency of the adders/subtractors.

Ports

Port	Dir	Data Type	Description
a	IN	2*BitWidth Fixed point	The first complex number whose higher BitWidth bits are its real part and lower BitWidth bits are its imaginary part.
b	IN	2*BitWidth Fixed point	The second complex number whose higher BitWidth bits are its real part and lower BitWidth bits are its imaginary part.
a+b	OUT	2*BitWidth Fixed point	Upper BitWidth bits are real(`a`)+real(`b`). Lower BitWidth bits are imaginary(`a`)-imaginary(`b`).
a-b	OUT	2*BitWidth Fixed point	Upper BitWidth bits are imaginary(`a`)+imaginary(`b`). Lower BitWidth bits are real(`b`)-real(`a`).

Description

Usage

The top output, a+b, is a complex output whose real part equals the sum of the real parts of a and b. The imaginary part of a+b equals the difference of the imaginary parts of a and b. The bottom output, a-b, is a complex output whose real part equals the sum of the imaginary parts of a and b.The imaginary part of a-b equals the difference of the real parts of b and a. The latency of this block is 2*add_latency.