A waveform shaping filter according to one embodiment includes a first resistor, a first transistor, a first capacitor, and a first amplifier. The first resistor includes one end to which a signal current is input and the other end. The first transistor includes a first terminal connected to the other end of the first resistor, a second terminal, and a control terminal. The first capacitor includes one end connected to the other end of the first resistor and the other end. The first amplifier includes an input terminal connected to the one end of the first resistor and an output terminal connected to the control terminal of the first transistor.

Low-noise amplifier (LNA) filters and processes for filtering global navigation satellite system (GNSS) signals are disclosed. The LNA filters can be used to down-convert a received GNSS signal to a lower frequency, filter the GNSS signal at the lower frequency, and up-convert the GNSS signal to the original frequency of the GNSS signal. The down-converted frequency can be selected based on a temperature of the GNSS signal to compensate for shifts in the frequency response of the filter due to temperature changes.

In accordance with an embodiment, an RF system includes a transmit path having a first tunable transmit band stop filter, and a power amplifier coupled to an output of the first tunable transmit band stop filter, where the first tunable transmit band stop filter is configured reject a receive frequency and pass a transmit frequency; a receive path comprising an LNA; and a duplex filter having a transmit path port coupled to an output of the power amplifier, a receive path port coupled to an input of the LNA, and an antenna port, where the duplex filter is configured to pass the transmit frequency and reject the receive frequency between the antenna port and the transmit path port, pass the receive frequency and reject the transmit frequency between the antenna port and the receive path port.

A compensation filter and a method for activating a compensation filter are disclosed. In an embodiment a compensation filter includes an operational amplifier, a capacitive element, a first and a second resistive element and a current converter. The compensation filter is configured to attenuate a common mode interference in a critical frequency range.

The invention relates to a circuit comprising a voltage reference (R) and a low-pass filter (F) electrically connected to the voltage reference (R). The filter (F) comprises a stage formed by a stage resistance (Re) electrically connected at a midpoint (M) to a stage capacitor (Ce), the stage resistance (Re) and the stage capacitor (Ce) at least partially defining a time constant of the filter and the midpoint (M) carrying the filtered reference voltage (V′ref). The circuit also comprises a transistor (T) and a control circuit (Cde) of the gate of the transistor (T) configured to bias the transistor (T) in conduction when the circuit (1) is turned on, the on-state resistance of the transistor (T) combining with the stage capacitor (Ce) to raise the filtered reference voltage (V′ref) with a settling time constant lower than the filter time constant.

Disclosed is receiver for a noise limited system. A front-end circuit amplifies and band-limits an incoming signal. The amplification increases the signal swing but introduces both thermal and flicker noise. A low-pass band limitation reduces the thermal noise component present at frequencies above what is necessary for correctly receiving the transmitted symbols. This band limited signal is provided to the integrator circuit. The output of the integrator is equalized to reduce the effects of inter-symbol interference and then sampled. The samples are used to apply low frequency equalization (i.e., in response to long and/or unbalanced strings of symbols) to mitigate the effects of DC wander caused by mismatches between the number of symbols of each kind being received.

An aspect includes a filtering method including operating a first filter to filter a first input signal to generate a first output signal; operating a second filter to filter a second input signal to generate a second output signal; and merging at least a portion of the second filter with the first filter to filter a third input signal to generate a third output signal. Another aspect includes a filtering method including operating switching devices to configure a filter with a first set of pole(s); filtering a first input signal to generate a first output signal with the filter configured with the first set of pole(s); operating the switching devices to configure the filter with a second set of poles; and filtering a second input signal to generate a second output signal with the filter configured with the second set of poles.

A circuit includes a filter, a first inverter, and a second inverter. The filter is coupled to an input of the first inverter. The second inverter includes an input and an output. The input of the second inverter is coupled to the output of the first inverter. The output of the second inverter is coupled to the input of the first inverter. The filter includes a notch filter and a bandpass filter.

According to an aspect, a tank circuit in an integrated circuit comprising a plurality of metal strips forming a first part of a closed contour enclosing a first area, a set of split sections forming a second part and geometrically aligned with the closed contour, and a plurality of capacitors coupled between the split sections to form the tank circuit, wherein a first flux linkage due a current flowing in the set of split sections pass through the first area in the same direction as that of a second flux linkage due to the current flowing in the plurality of metal strips, and the set of split sections and the plurality of metal strips together forming an inductance coil.

A resistor-capacitor (RC) sensor circuit of an electronic device is driven to a drive voltage using a representative copy of a current that drives an electronic circuit line of the electronic device. The RC sensor circuit is to sample voltages that are indicative of an RC time constant of the electronic circuit line. A first sample voltage is determined by sampling a first representative voltage generated at the RC sensor circuit by driving the RC sensor circuit with the representative copy of the current over a first time period. A second sample voltage is determined by sampling a second representative voltage generated at the RC sensor circuit by driving the RC sensor circuit with the representative copy of the current over a second time period. A ratio of the first sample voltage and the second sample voltage is indicative of the RC time constant of the electronic circuit line.