×

Low-cost receiver using integrated inductors

  • US 9,209,838 B2
  • Filed: 02/02/2015
  • Issued: 12/08/2015
  • Est. Priority Date: 01/03/2012
  • Status: Active Grant
First Claim
Patent Images

1. A receiver comprising:

  • a first amplifier having an input for receiving a radio frequency signal, and an output;

    a first filter having an input coupled to the output of the first amplifier, a tuning input, and an output, for substantially passing frequencies below a variable cutoff frequency, the variable cutoff frequency being less than an upper frequency threshold of the first filter;

    a second filter having an input coupled to the output of the first amplifier, a tuning input, and an output, for substantially passing frequencies within a band above a lower threshold frequency of the second filter and below an upper threshold frequency of the second filter;

    wherein the first filter comprises;

    a first variable capacitor having a first terminal coupled to the output of the first amplifier, a second terminal coupled to a power supply voltage terminal, and a control terminal for receiving a tuning signal; and

    an inductance leg having a first terminal coupled to the output of the first amplifier, and a second terminal coupled to the power supply voltage terminal, the inductance leg including a first inductor and having an effective resistance in series with the inductor, wherein the effective resistance has a value related to an upper cutoff frequency to be tuned by the first filter.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×