Telefonaktiebolaget Lm Ericsson (publ)

Pietro Andreani

Sven Erik Mattisson

Thomas Mattsson

Daniele Mastantuono

Luca Fanori

Martin Anderson

Mattias Palm

Embodiments disclosed herein relate to oscillators including methods of operating the same, for example for use in radio frequency circuits. In an embodiment, an oscillator has cross-coupled transistors connected between a resonant circuit and a tail circuit. The resonant circuit and tail circuit have respective supply connections for powering the oscillator with an external power supply and the cross-coupled transistors have a bias circuit coupled to respective gates of the cross-coupled transistors and arranged to bias said transistors in an active region of operation. The tail circuit has a current source, a tail capacitor and a tail resistor coupled between a common node of the cross-coupled transistors and the supply connection of the tail circuit.

Oscillator with biased cross-coupled transistors, a current source, a tail resistor and a tail capacitor

The present disclosure generally relates to the field of receiver structures in radio communication systems and more specifically to passive mixers in the receiver structure and to a technique for converting a first signal having a first frequency into a second signal having a second frequency by using a third signal having a third frequency. A passive mixer for converting a first signal having a first frequency into a second signal having a second frequency by using a third signal having a third frequency comprises a cancellation component for generating a first cancellation signal for cancelling second order intermodulation components by superimposing the first signal weighted by a cancellation value on the third signal; and a mixing component having a first terminal for receiving the first signal, a second terminal for outputting the second signal, and a third terminal for receiving the first cancellation signal, wherein the mixing component is adapted to provide the second signal as output at the second terminal by mixing the first signal provided as input at the first terminal and the first cancellation signal provided as input at the third terminal.

Passive mixer with reduced second order intermodulation

An oscillator circuit () comprises a first tank circuit (T) comprising an inductive element (L) and a capacitive element (C) coupled in series between a first voltage rail () and a first drive node (). A feedback stage (F) is coupled to a first tank output () of the first tank circuit (T) and to the first drive node (). The feedback stage (F) is arranged to generate, responsive to a first oscillating tank voltage present at the first tank output (), a first oscillating drive signal at the first drive node () in-phase with a first oscillating tank current flowing in the inductive element (L) and the capacitive element (C), thereby causing the oscillator () to oscillate in a series resonance mode of the inductive element (L) and the capacitive element (C).

Series-resonance oscillator

The present disclosure generally relates to the field of receiver structures in radio communication systems and more specifically to passive mixers in the receiver structure and to a technique for converting a first signal having a first frequency into a second signal having a second frequency by using a third signal having a third frequency. A passive mixer for converting a first signal having a first frequency into a second signal having a second frequency by using a third signal having a third frequency comprises a cancellation componentfor generating a first cancellation signal for cancelling second order intermodulation components by superimposing the first signal weighted by a cancellation value on the third signal; and a mixing componenthaving a first terminalfor receiving the first signal, a second terminalfor outputting the second signal, and a third terminalfor receiving the first cancellation signal, wherein the mixing componentis adapted to provide the second signal as output at the second terminalby mixing the first signal provided as input at the first terminaland the first cancellation signal provided as input at the third terminal

An inductor layout comprising a first inductor and a second inductor. The first and second inductors are electrically and magnetically independent inductors concentrically arranged on an integrated circuit. At least one of the first and second inductors is a multi-loop inductor with a first axis of symmetry.

Inductor layout, and a voltage-controlled oscillator (VCO) system

An oscillator circuit comprises a first tank circuit comprising an inductive element and a capacitive element coupled in series between a first voltage rail and a first drive node. A feedback stage is coupled to a first tank output of the first tank circuit and to the first drive node. The feedback stage is arranged to generate, responsive to a first oscillating tank voltage present at the first tank output, a first oscillating drive voltage at the first drive node in-phase with a first oscillating tank current flowing in the inductive element and the capacitive element, thereby causing the oscillator to oscillate in a series resonance mode of the inductive element and the capacitive element.

A frequency selective circuit configured to convert an analog input signal to a digital output signal comprises an analog-to-digital converter () to generate the digital output signal of the circuit based on an analog input signal to the analog-to-digital converter (); a digital-to-analog converter () to generate an analog feedback signal based on the digital output signal from the analog-to-digital converter (), and an analog filter arranged to generate the analog input signal to the analog-to-digital converter based on the analog feedback signal and an analog input signal to the circuit. The analog filter comprises at least two integrators () in series, each having a feedback path comprising the analog-to-digital converter () in cascade with a digital-to-analog converter (), so that the overall noise transfer function of the circuit has at least two zeros in addition to zeros in the noise transfer function of the analog-to-digital converter.

Frequency selective circuit configured to convert an analog input signal to a digital output signal

An inductor layout () comprising a first inductor () and a second inductor (). The first and second inductors () are electrically and magnetically independent inductors concentrically arranged on an integrated circuit. At least one of the first and second inductors () is a multi-loop inductor with a first axis () of symmetry.

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Lund, Sweden

Pietro Andreani