公开(公告)号：US09379727B1

公开(公告)日：2016-06-28

申请号：US14628996

申请日：2015-02-23

Applicant: QUALCOMM Incorporated

Inventor： Dongwon Seo ,  Yang You ,  Honghao Ji ,  Tongyu Song ,  Ganesh Saripalli ,  Shahin Mehdizad Taleie

IPC: H03M1/06 ,  H03M1/70 ,  H04B1/04 ,  G05F3/18 ,  G05F1/56 ,  H03M1/00 ,  H03M1/74 ,  G05F1/575 ,  H02M3/156

CPC classification number: H03M1/0604 ,  G05F1/56 ,  G05F1/575 ,  G05F3/18 ,  H02M3/156 ,  H03F3/24 ,  H03M1/00 ,  H03M1/70 ,  H03M1/747 ,  H04B1/0475 ,  H04B2001/0408

Abstract: A method and apparatus for attenuating transmit digital to analog converter (DAC) spurs is provided. The method begins when a reference voltage is injected into an amplifier. Next, an output of the ground low drop-out regulator is measured and is them compared with the reference voltage. The output of the amplifier is then adjusted based on the results of the comparison. If the reference voltage is higher then the output of the ground low drop-out regulator the output of the amplifier is adjusted to ground. If the reference voltage is lower than the output of the ground low drop-out regulator then the output of the amplifier is adjusted to match the reference voltage.

Abstract translation: 提供了用于衰减发射数模转换器（DAC）杂散的方法和装置。 当将参考电压注入放大器时，该方法开始。 接下来，测量接地低压降稳压器的输出，并将其与参考电压进行比较。 然后根据比较结果调整放大器的输出。 如果参考电压较高，则接地低压降稳压器的输出将放大器的输出调整到地。 如果参考电压低于接地低压降稳压器的输出，则调节放大器的输出以匹配参考电压。