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| 20080290940 | DIFFERENTIAL LOW NOISE AMPLIFIER (LNA) WITH COMMON MODE FEEDBACK AND GAIN CONTROL - A method, algorithm, architecture, circuits, and/or systems for low noise amplification are disclosed. In one embodiment, an amplifier can include an input stage, including a first differential input configured to receive a differential signal, a first current source coupled to the first differential input, a first current load receiving a first bias voltage and coupling the input stage to a first power supply, and a first pair of common mode feedback transistors, coupled to an output of the first current load and configured to limit a current to the first current source. The input stage provides an amplified signal to an additional stage having a structure similar to the input stage, configured to further amplify the amplified signal. | 11-27-2008 |
| 20080292022 | Radio Receiver Including a Delay-Locked Loop (DLL) for Phase Adjustment - A method, algorithm, architecture, circuits, and/or systems for using a delay-locked loop (DLL) for phase adjustment in a direct conversion radio receiver are disclosed. In one embodiment, a receiver circuit can include: (i) a voltage-controlled oscillator (VCO) for providing a reference clock; (ii) a delay element that can receive the reference clock and provide a delay adjustment signal; (iii) a first channel for receiving a radio signal and providing a recovered radio signal from the radio signal and the delay adjustment signal, where the first channel includes a first mixer and a first filter; and (iv) a second channel for receiving the radio signal and a phase adjustment signal derived from the delay adjustment signal and for providing a delay control signal to the delay element from the radio signal and the phase adjustment signal, where the second channel includes a second mixer and a second filter. | 11-27-2008 |
| 20080305760 | Envelope Detector for AM Radio - A receiver for receiving an amplitude modulated (AM) signal may include a first and a second detector for detecting the maximum and minimum envelope values, respectively, of the received AM signal and an equalizer for periodically equalizing the maximum and minimum envelope values. A method for receiving an AM signal may include unidirectionally increasing a first output signal up to the maximum envelope value, unidirectionally decreasing a second output signal down to the minimum envelope value, and periodically equalizing the first and the second output signals. | 12-11-2008 |
| 20090033433 | Circuits, Systems, and Methods for a Voltage Controlled Oscillator with Coarse, Fine, and Center Tuning - Circuits, systems, and methods for generating a variable oscillator output. The circuits generally comprise a capacitor configured to receive first and second currents of a first polarity (e.g., charging currents) and a third current of a second polarity opposite to the first polarity (e.g., a discharge current). The circuit further comprises a first circuit configured to receive a bias input, a second circuit configured to receive a coarse control input, and a third circuit configured to receive a fine control input. The first circuit is further configured to provide the first current in response to the bias input. The second circuit is further configured to provide the second current in response to the coarse control input, such that the second current generally has a magnitude of from zero to a multiple of the magnitude of the first current. The third circuit is further configured to provide the third current when the capacitor has a voltage that passes a threshold voltage determined by the fine control input. The present invention advantageously provides for producing a variable oscillator output over a broad range with the coarse control input, while also having low gain with the fine control input. The present invention is also advantageously suitable for standard integrated circuit manufacturing processes because the bias input can be adjusted to compensate for process variations. | 02-05-2009 |
| 20090079499 | Differential Low Noise Amplifier (LNA) With Common Mode Feedback And Gain Control - A method, algorithm, architecture, circuits, and/or systems for low noise amplification are disclosed. In one embodiment, an amplifier can include an input stage, including a first differential input configured to receive a differential signal, a first current source coupled to the first differential input, a first current load receiving a bias voltage and coupling the input stage to a first power supply, and a first pair of common mode feedback transistors, coupled to an output of the first current load and configured to limit a current to the first current source. The input stage provides an amplified signal to an additional stage having a structure similar to the input stage, configured to further amplify the amplified signal. | 03-26-2009 |
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| 20080267313 | Dual Demodulation Mode AM Radio - Apparatuses and methods for receiving an amplitude modulated signal in one of two modes depending on the quality of the received signal. In a first mode, the amplitude modulated signal is converted directly to a baseband signal. In a second mode, the amplitude modulated signal is converted to an intermediate frequency signal. The present invention advantageously combines direct conversion and image-rejection heterodyne receiver topologies with a relatively large degree of component reuse and relatively few additional components. | 10-30-2008 |
| 20090102555 | Automatic gain Control (AGC) with lock detection - A method, algorithm, circuits, and/or systems for automatic gain control (AGC) are disclosed. In one embodiment, an AGC circuit can include a comparator configured to compare an output of an amplifier against a reference voltage, gain logic configured to decrease a gain of the amplifier when an output of the comparator has a first state, and to periodically increase the gain of the amplifier, a digital-to-analog converter (DAC) configured to receive an output from the gain logic and control the gain of the amplifier, and lock detection logic configured to determine from the output of the gain logic when the gain of the amplifier is in a predetermined range. | 04-23-2009 |
| 20090247100 | Dual Threshold Demodulation in an Amplitude Modulation Radio Receiver - A method, algorithm, circuits, and/or systems for demodulation in an amplitude modulated (AM) radio receiver are disclosed. In one embodiment, a radio receiver can include an amplifier configured to receive a radio frequency (RF) input signal and a gain control signal, and provide an amplified signal, an automatic gain control (AGC) circuit configured to receive a high threshold comparator output and provide the gain control signal, a mixer configured to combine the amplified signal and a local oscillation signal and provide a mixed output, a high threshold comparator configured to compare the mixed output with a reference level and provide the high threshold comparator output, and a low threshold comparator configured to compare the mixed output with the reference level and provide an output of the radio receiver. | 10-01-2009 |
| 20100120389 | Replica DLL for Phase Resetting - A method, algorithm, architecture, circuits, and/or systems for using a delay-locked loop (DLL) for phase adjustment in a direct conversion radio receiver are disclosed. The DLL is configured to avoid a perceived phase shift when the control voltage to a delay line is reset upon reaching a predetermined amount. Embodiments disclosed include a DLL, a radio receiver using the DLL, a circuit for resetting the DLL, a method for recovering a modulated radio signal, and a method of synchronizing a reference clock to a radio signal. The approach can allow for improved synchronization of the reference clock to a received radio signal during baseband frequency recovery. | 05-13-2010 |
