US 9,811,104 B2
Reference voltage generator system for reducing noise
Jerry L. Doorenbos, Tucson, AZ (US)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Mar. 11, 2015, as Appl. No. 14/644,788.
Claims priority of provisional application 61/951,300, filed on Mar. 11, 2014.
Prior Publication US 2015/0261246 A1, Sep. 17, 2015
Int. Cl. G05F 3/02 (2006.01); G05F 3/20 (2006.01); G05F 3/30 (2006.01); G05F 3/22 (2006.01)
CPC G05F 3/02 (2013.01) [G05F 3/205 (2013.01); G05F 3/30 (2013.01); G05F 3/225 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A reference voltage generator system comprising:
an amplifier configured to generate a reference voltage based on a respective input voltage provided at each of at least one input of the amplifier; and
at least one input transistor configured as a bipolar junction transistor (BJT) and coupled to the at least one input of the amplifier, the at least one input transistor biased to conduct a current to set an amplitude of the respective input voltage provided at each of the at least one input of the amplifier, each of the at least one input transistor comprising a base terminal that is coupled in series with an input resistor, wherein a resistance value Rb of the input resistor is selected based on:

OG Complex Work Unit Drawing
where:
VT is a thermal voltage associated with the at least one input transistor,
Ib is a base current associated with the at least one input transistor, and
Ie is an emitter current associated with the at least one input transistor.