7 results about "Gilbert cell" patented technology

The invention discloses an impedance-invariant vector synthesis phase shifter, an array element and a phased array, and relates to the technical field of phased array design. According to the impedance-invariant vector synthesis phase shifter provided by the invention, two capacitive compensation branches are arranged in each Gilbert unit of a variable gain amplifier, and the capacitive compensation branches are connected to a circuit only when bits are turned off, so that the output impedance of the unit is kept unchanged when the bits are turned on and turned off, and the output impedance of the unit is not changed when the bits are turned off. The phase shifting precision of the phase shifter is effectively improved, the root mean square phase error of the phase shifter is reduced to be within the acceptable range of the engineering field, phase shifting is directly carried out according to the most ideal condition based on IQ orthogonal signals, complicated calibration work is avoided, and the calibration problem of the vector synthesis phase shifter is solved. The invention further provides an array element which adopts the impedance-invariant vector synthesis phase shifter, the continuous time linear equalizer and the current mode attenuator and has the advantage of being convenient to deploy.

The invention discloses an adaptive adjustment multi-phase filter for generating microwave orthogonal signals, a single-stage multi-phase filter generates the orthogonal signals which have no amplitude error but only have no phase error at the center frequency, and a resistance device is realized through an NMOS (N-channel Metal Oxide Semiconductor) transistor; the phase detector is realized through a fully differential analog multiplier based on a Gilbert unit; two sinusoidal signals with the same frequency, the same amplitude and different phase differences are mixed and filtered through the multiplication circuit to generate a direct current output item, the direct current output item is in direct proportion to the input phase difference, and when the input phase difference is just 90 degrees, the output reaches the minimum value; the phase detector continuously detects the accuracy of a quadrature phase and converts an input phase error into a corresponding direct current output voltage, the output voltage of the detector drives the grid electrode of the NMOS transistor, and the center frequency of the multi-phase filter is always at the input signal frequency through continuous feedback adjustment, so that the minimum quadrature error is ensured.

The present invention discloses an active phase shifter with temperature compensation, comprising an input transformer balun, a polyphase filter, a vector modulation module based on a Gilbert cell, an output transformer balun, and a positive temperature coefficient current source. The input transformer balun is used to convert a single-ended input signal into a differential signal; the polyphase filter is used to convert the differential signal into a quadrature signal; the vector modulation module based on the Gilbert cell is used to select polarity and perform vector synthesis on the quadrature signal; the output transformer balun is used to convert the differential signal at the output into a single-ended signal; and the positive temperature coefficient current source is used to control the gain of the Gilbert cell. By designing a temperature-dependent positive temperature coefficient current source, the present invention mitigates the temperature-dependent gain change of the vector modulation module, thereby improving the stability of the key performance of the active phase shifter within a temperature range of 55 to 85°C.

This invention relates to a wideband, low-error 6-bit active vector synthesis phase shifter for phase control of radio frequency signals. It includes an orthogonal signal generator, a wideband input matching network for the I / Q branch, a variable gain amplifier for the I / Q branch, a wideband output matching network, and a shift register. The orthogonal signal generator employs an RL multiphase filter (RLPP) based on a transformer structure, reducing losses caused by capacitive loads, saving space, and implementing a two-stage cascaded structure to extend bandwidth. An electromagnetically coupled resonator is used as the input and output wideband matching network for the variable gain amplifier, effectively extending the circuit bandwidth. Furthermore, a variable gain amplifier with adjustable tail current is designed, connected to two current mirror arrays through the tail current node in a Gilbert cell structure, enabling coarse and fine phase shift control of the phase shifter, thereby improving the phase shift accuracy.

The present invention belongs to the field of multipliers, and specifically relates to an analog multiplier with high linearity and large output swing. The analog multiplier includes a first common-mode level adjustable single-ended-to-differential circuit, a second common-mode level adjustable single-ended-to-differential circuit, and a folded CMOS Gilbert cell. The first common-mode level adjustable single-ended-to-differential circuit receives an analog input signal A and a common-mode level VCMA at its two input terminals, and outputs differential signals AP and AN to the first two input terminals of the folded CMOS Gilbert cell at its two output terminals. The second common-mode level adjustable single-ended-to-differential circuit receives an analog input signal B and a common-mode level VCMB at its two input terminals, and outputs differential signals BP and BN to the second two input terminals of the folded CMOS Gilbert cell at its two output terminals. The folded CMOS Gilbert cell outputs analog output signals OUTP and OUTN at its two output terminals. The present invention can significantly improve the linearity and output swing of the analog multiplier's output signal.

The invention discloses a high-precision adjustable large-swing range integrated multi-channel driving circuit, on one hand, a pre-stage gain adjustable circuit is adopted to calibrate gain deviation and realize multi-channel integration, and on the other hand, a post-stage large-swing adjustable output stage circuit is adopted to realize multi-channel integration by combining digital coarse tuning and analog fine tuning functions. And the large-range high-precision adjustment of the output signal amplitude is realized. The driving circuit adopts a BiCMOS (Bipolar Complementary Metal-Oxide-Semiconductor Transistor) process, and a pre-stage gain adjustable circuit realizes gain deviation calibration through an improved Gilbert unit circuit structure and is compatible with a multi-channel integration function. Besides, a rear-stage large-swing adjustable output stage circuit controls the on-off of a tail current source through a switch, so that the swing range of an output signal reaches 3.0 V, and the tail current source of the current mode logic circuit is continuously adjusted within a certain range by integrating a 14-bit digital-to-analog converter circuit. And the fine adjustment resolution of the output signal amplitude is less than 0.2 mV.

The application discloses an impedance-invariant vector synthesis phase shifter, an array element and a phased array, and relates to the technical field of phased array design. The application provides the impedance-invariant vector synthesis phase shifter, two capacitive compensation branches are arranged in each Gilbert cell of a variable gain amplifier, and the capacitive compensation branches are only connected to the circuit when the bit is turned off, so that the output impedance of the cell remains unchanged when the bit is turned on and turned off, the phase shifting precision of the phase shifter is effectively improved, the root mean square phase error of the phase shifter is reduced to the acceptable range in the engineering field, the phase shifting is directly carried out according to the most ideal condition based on the IQ quadrature signal, the complicated calibration work is avoided, and the calibration problem of the vector synthesis phase shifter is solved. The application further provides the array element, which adopts the impedance-invariant vector synthesis phase shifter, a continuous time linear equalizer and a current mode attenuator, and has the advantage of convenient deployment.