30 results about "Gilbert mixer" patented technology

A Gilbert cell mixer design is disclosed. Instead of using a differential transconductance stage as typically done, the design employs a differential transimpedance amplifier input stage. By utilizing a transimpedance input stage to the Gilbert mixer, feedback is used to obtain higher linearity without sacrificing noise performance. The transimpedance input stage supplies a current signal to the cascode connected Gilbert switching quad, so the transimpedance amplifier output is taken from the collector of the transimpedance amplifier output transistor, instead of the emitter as normally done with transimpedance amplifiers.

Method and system are disclosed for providing an improved linearity Gilbert mixer. The Gilbert mixer of the present invention includes a conventional mixer core coupled to a high linearity, multistage amplifier. The multistage amplifier includes two or more transistor stages connected together in a global feedback arrangement. The global feedback provides a greater loop gain for the amplifier than the local feedback arrangement, thereby increasing the linearity of the amplifier. In addition, having more than one transistor stage in the amplifier serves to increase the isolation of the RF input signal from the LO input signal. Furthermore, by providing parallel output stages in the multistage amplifier, several mixer cores may be driven from the same source while sharing the feedback mechanism.

A frequency conversion circuit (800) is configured to mix a first input signal (RF+,RF-) at a first frequency with a second input signal (LO+,LO-) at a second frequency to provide an output intermediate frequency signal (IFout). The circuit (800) comprises: first and second mixing modules(801a, 801b), each mixing module comprising a voltage to current converter (802a, 802b) configured to receive the first input signal (RF+,RF-) and connected to a Gilbert mixer (803a, 803b)configured to receive the second input signal (LO+,LO-); an intermediate frequency output circuit(804) having inputs connected to receive an intermediate frequency current signal (IF+,IF-) from outputs of each of the Gilbert mixers (803a, 803b) and an output configured to provide the output intermediate frequency voltage signal (IFout), wherein the first and second mixing modules comprise transistors which are complementary to each other.

A frequency conversion circuit configured to mix a first input signal (RF+,RF−) at a first frequency with a second input signal (LO+,LO−) at a second frequency to provide an output intermediate frequency signal (IFout), the circuit comprising: first and second mixing modules, each mixing module comprising a voltage to current converter configured to receive the first input signal (RF+,RF−) and connected to a Gilbert mixer configured to receive the second input signal (LO+,LO−); an intermediate frequency output circuit having inputs connected to receive an intermediate frequency current signal (IF+,IF−) from outputs of each of the Gilbert mixers and an output configured to provide the output intermediate frequency voltage signal (IFout), wherein the first and second mixing modules comprise transistors which are complementary to each other.

The invention discloses an active Gilbert mixer of low third order cross modulation distortion. The mixer of the invention is designed mainly aiming at improving active Gilbert mixer third order cross modulation distortion. The active Gilbert mixer of the low third order cross modulation distortion comprises a Multi-tanh doublet transconductance unit with an emitter feedback resistor. The Multi-tanh doublet transconductance unit with the emitter feedback resistor is connected to a transconductance correction differential pair used for correcting the generated transconductance. In the invention, through introducing the transconductance correction differential pair in the Multi-tanh doublet transconductance unit with the emitter feedback resistor, a current which is output to a current commutation switch pair in the Multi-tanh doublet transconductance unit contains the small third order cross modulation distortion so that a mixing linearity of the whole mixer is increased.

The invention discloses a current reuse high linearity folding current mirror mixer. A double balanced frequency mixing switch pair is embedded into a current mirror, under common effect of the current mirror and the double balanced switch pair, radio frequency current of a transconductance grade generates an intermediate frequency current signal after frequency conversion, amplitude is consistent with the radio frequency current of the transconductance level, and output voltage is formed on a load resistor. According to the structure based on the current mirror, linearity deterioration of a traditional foldable Gilbert mixer caused by cascade is avoided, simultaneously, input and output static bias current of the current mirror are reused, and an inductance capacitor parallel network is used to realize isolation of a radiofrequency signal. According to the series connected gate tube, on one hand, isolation of an output terminal intermediate frequency signal from a radio frequency transconductance grade output terminal is realized, on the other hand, voltage fluctuation of a current mirror output terminal is stabilized, and accuracy of current mirror duplication is raised. The input and output static bias current of the current mirror is injected to the transconductance grade, current utilization efficiency is raised, and power consumption is reduced.

A power mixer circuit. The circuit combines a Gilbert mixer circuit and a power amplifier circuit. The power mixer circuit comprises, sequentially electrically connected, a transconductance stage circuit, a gain bootstrap circuit, a switch stage circuit, and a load circuit. The transconductance stage circuit is used to input a baseband signal. The gain bootstrap circuit is used to stabilize the output voltage of the transconductance stage circuit. The switch stage circuit is used to control the switch of the switch stage circuit on the basis of a local oscillator signal, such that the switch performs a switching function. The load circuit is used to connect a load. Relative to the prior art, the present power mixer circuit has low power consumption, low costs, and high linearity.

The invention belongs to the technique area of the wireless communication receptor system related to the Gilbert mixer with folded structure. The mixer is the symmetric structure composed of the MOS tubes M1 and M2, M3 and M4, M5 and M6 as well as the resistors R1 and R2. The character is that the MOS tubes M3-M6 are PMOS tubes. The invention increases one degrees of freedom of the power consumption in the designing circuits, weakens the crossrelation among the noise, linearity and the conversion gain. Thus, the three targets can be optimized respectively. The cost paid directly for the optimization is the power consumption in the stead of deteriorating other targets.

The present invention discloses a current mirror and DOCCII (dual-output current conveyor)-based wideband radio mixer. The wideband radio mixer provided by the invention is composed of a dual-NMOS-PMOS current mirror mixing unit and a current output stage; four dual-NMOS-PMOS current mirrors embedded with local oscillation signals vLO+ / - are combined together so as to form the dual-NMOS-PMOS current mirror mixing unit; the dual-NMOS-PMOS current mirror mixing unit is used for executing the input stage and passive switch core of the mixer and is equivalent to the double-balance topological structure of a traditional active Gilbert mixer; the in-phase current output ends and anti-phase current output ends of two dual-output current conveyors are in cross coupled connection with each other, so that the current output stage can be formed; and the current output stage is adopted as the transimpedance amplifier of a conventional passive mixer; and the current output stage has very low input impedance and high output impedance and is used for achieving the amplification of output current signals which have been subjected to pre-frequency conversion and effectively driving a next-stage circuit. According to the wideband radio mixer provided by the invention, inductive passive components are not required. The wideband radio mixer can simultaneously have the advantages of the active Gilbert mixer and the passive mixer.

The invention provides a low-voltage CMOS folding co-source co-grid mixer. The mixer includes the following parts: a pair of transconductance poles composed of NMOS tubes, tow pairs of switch poles composed of NMOS tubes, a pair of load poles composed of NMOS, and a current source. In the structure of the mixer circuit, the transconductance poles are connected with the switch poles in a co-sourceco-grid method. The invention solves the problems of the high power supply high voltage caused by the overlapping of the transconductance poles and the switch poles of the traditional Gilbert mixer, and the compromise design between the high transconductance and the high linearity of the transconductance poles and the low noise of the switch poles. The invention can be used in the application of the deep submicron RF CMOS circuit, in particular in the design developing of the satellite navigation double-system compatible receiver radio frequency integrated circuit. The invention has bright application prospect in both the military and the civilian fields.

The invention discloses a Gilbert up-mixer applied to the LTE MTC power Internet of Things, which belongs to the technical field of wireless communication transmitters, and includes: a transconductance stage for converting an input intermediate frequency voltage signal into a current signal; a switch stage , used to alternately control the conduction and cut-off of the switch tube through the local oscillator signal; the load stage is used to convert the current signal after the up-mixing into a voltage signal output; two filter capacitors connected to the transconductance stage are used to filter In addition to the signal leakage of the local oscillator signal to the transconductance stage. The two filter capacitors are selected so that the transmission bandwidth of the transconductance stage is twice that of the intermediate frequency voltage signal. The present invention only adds two filter capacitors to the ground on the transconductance stage of the Gilbert upper mixer, so that the signal transmission bandwidth at the drain of the transconductance stage is changed, and the signal fed through the local oscillator to the input terminal can be filtered out. Improve port isolation without affecting the transmission of intermediate frequency signals and other performances of the circuit.