US 7,321,328 B1
Single bit DAC with tristate driver
Todd Sutton, Del Mar, Calif. (US)
Assigned to NextWave Broadband Inc., San Diego, Calif. (US)
Filed on Sep. 01, 2006, as Appl. No. 11/469,782.
Int. Cl. H03M 1/82 (2006.01)
U.S. Cl. 341—152  [341/144] 16 Claims
OG exemplary drawing
 
1. A method of producing an analog output from a received digital input, the method comprising:
receiving a digital pulse train having an average value which is proportional to a digital conversion value;
driving the pulse train at a periodic interval to produce a modulated tristate-gate output;
averaging the modulated tristate-gate output to produce an analog signal reflective of the digital conversion value; and
driving the pulse train at a second periodic interval, the second periodic interval having a duty cycle of less than 50% so that the modulated tristate-gate output is more often disabled than enabled.