Title:
【発明の名称】複素電気信号の位相角決定方法及び回路
Document Type and Number:
Japanese Patent JPH0782047
Kind Code:
B2
Abstract:
Methods and circuits for implementing them determine the phase angle of a complex electrical signal from the in-phase and quadrature components of the signal by truncating the magnitudes of the real and imaginary components of the signal and combining them to form an address which is then used to access a lookup table containing angular values. However, if both of the values are small, before they are truncated they are both expressed in terms of a lowest common exponent, i.e., shifted left as much as possible without affecting their ratio. The phase angle from -180 to +180 degrees may be found directly from the lookup table, or, in an alternative variation on the method, a single-quadrant angle is looked up in a shorter table and then supplemented according to quadrant information contained in the signs of the values to produce the total phase angle. Circuits are disclosed for implementing both methods for inputs in 2's complement or sign and magnitude form.
Inventors:
Amed Mf Ced
Application Number:
JP8783289A
Publication Date:
September 06, 1995
Filing Date:
April 06, 1989
Export Citation:
Assignee:
Tektronix Incorporated
International Classes:
G01R23/16; G01R25/00; (IPC1-7): G01R23/16; G01R25/00
Domestic Patent References:
| JP60193028A | ||||
| JP59216247A | ||||
| JP5935054B2 |
Attorney, Agent or Firm:
Sony Tektronix Inc.
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