CN109361361B - Ultra-wideband high-linearity up-conversion circuit - Google Patents
Ultra-wideband high-linearity up-conversion circuit Download PDFInfo
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- CN109361361B CN109361361B CN201811491703.3A CN201811491703A CN109361361B CN 109361361 B CN109361361 B CN 109361361B CN 201811491703 A CN201811491703 A CN 201811491703A CN 109361361 B CN109361361 B CN 109361361B
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/14—Balanced arrangements
- H03D7/1425—Balanced arrangements with transistors
- H03D7/1458—Double balanced arrangements, i.e. where both input signals are differential
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/14—Balanced arrangements
- H03D7/1425—Balanced arrangements with transistors
- H03D7/1441—Balanced arrangements with transistors using field-effect transistors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses an ultra-wideband high-linearity up-conversion circuit, and belongs to the technical field of analog radio frequency integrated circuits. The dual-balanced type active double-balanced mixer circuit comprises a plurality of I/Q two-path active double-balanced mixer circuits which are sequentially cascaded, wherein each I/Q two-path active double-balanced mixer circuit comprises a first load resistor pair, a second load resistor pair, an I-path active double-balanced mixer pair and a Q-path active double-balanced mixer pair, each I-path active double-balanced mixer pair and each Q-path active double-balanced mixer pair comprises two differential amplifying pairs with tail current sources, and each tail current source is connected with a pair of complementary switching tubes. The invention can complete up-conversion modulation of I/Q two paths of signals at the same time, realize high-linearization signal frequency conversion in an ultra-wideband range, improve the integration level of a circuit, increase the power of an output signal, reduce the power consumption of the whole circuit and effectively reduce the area of a chip.
Description
Technical Field
The invention relates to the technical field of analog radio frequency integrated circuits, in particular to an ultra-wideband high-linearity up-conversion circuit.
Background
The up-converter and the power amplifier belong to a core module in a transmitter, the two modules are independent modules, the up-converter realizes the frequency spectrum shifting from a baseband signal to a radio frequency signal, and the power amplifier realizes the power amplification of the signal.
In general, in order to improve gain and output power, an up-converter generally uses a Tank formed by an inductor and a capacitor as a load, but the area of the inductor and the area of the capacitor are larger, and meanwhile, the frequency selection characteristic of the Tank reduces the working bandwidth of the up-converter, so that the working bandwidth of a circuit is limited, and the use mode is limited.
On the other hand, the output power of the traditional up-converter is not high, the output saturated power of the traditional up-converter is generally about 0dBm, the use requirement of most communication systems on the transmitting power cannot be met, and the requirement of the system on the transmitting power can be met only by introducing an amplified radio frequency signal of a power amplifier at a later stage.
Disclosure of Invention
In view of this, the present invention provides an ultra-wideband high linearity up-conversion circuit, which can complete up-conversion modulation of two paths of signals of I/Q at the same time, and realize high-linearity signal frequency conversion in ultra-wideband range, and has the characteristics of large output power and high circuit integration level.
In order to solve the technical problems, the invention adopts the following technical scheme:
the ultra-wideband high-linearity up-conversion circuit comprises a plurality of I/Q two-path active double-balanced mixer circuits which are sequentially cascaded, wherein the output of the former I/Q two-path active double-balanced mixer circuit is used as the input of the latter I/Q two-path active double-balanced mixer circuit, the I/Q two-path active double-balanced mixer circuit comprises a first load resistor pair, a second load resistor pair, an I path active double-balanced mixer pair and a Q path active double-balanced mixer pair, the I path active double-balanced mixer pair and the Q path active double-balanced mixer pair comprise two differential amplification pairs with tail current sources, and each tail current source is connected with a pair of complementary switching tubes;
each I/Q two-path active double-balanced mixer circuit receives an externally input radio frequency I path differential signal, a radio frequency Q path differential signal, a local oscillator I path differential signal, a local oscillator Q path differential signal and a switch control signal; the switch control signal is used for controlling the on-off of the complementary switch tube;
positive and negative signals of the radio frequency I path differential signals are respectively input to two tail current sources of the I path active double-balanced mixing pair through corresponding complementary switching tubes, the current sizes of the tail current sources are controlled, the local oscillation I path differential signals are connected to the input ends of each differential amplifying pair in the I path active double-balanced mixing pair, the switching of the currents in the differential amplifying pair is controlled, and multiplication mixing output of the local oscillation I path signals and the radio frequency I path signals is achieved;
positive and negative signals of the radio frequency Q-channel differential signals are respectively input to two tail current sources of the Q-channel active double-balanced mixing pair through corresponding complementary switching tubes, the two tail current sources are used for controlling the current magnitude of the tail current sources, the local oscillation Q-channel differential signals are connected to the input ends of each differential amplifying pair in the Q-channel active double-balanced mixing pair, the switching of the currents in the differential amplifying pair is controlled, and multiplication mixing output of the local oscillation Q-channel signals and the radio frequency Q-channel signals is realized;
the first load resistor pair is used for converting output current signals of the differential amplification pairs into voltage signals, and after the converted voltage signals corresponding to the differential amplification pairs and input signals of the I/Q two-path active double-balanced mixer circuit are overlapped together, the output signals are buffered and output through the second load resistor pair.
Specifically, the total number of the I/Q two-path active double-balanced mixer circuits is eight.
Compared with the background technology, the invention has the following advantages:
(1) The invention does not adopt inductance, and compared with the traditional up-converter, the invention greatly reduces the chip area;
(2) According to the invention, only the resistor is used as a load, so that the working bandwidth is improved, and the matching of an external circuit is facilitated;
(3) The circuit of the invention has the functions of up-conversion and power amplification, and the frequency conversion and the amplification are multiplexed, so that the circuit structure is simple, the integration level is higher, and the power consumption of the chip is reduced.
In a word, the invention adopts a two-path double-frequency balance mixer circuit structure, can simultaneously complete up-conversion modulation of I/Q two paths of signals, can realize high-linearization signal frequency conversion in an ultra-wideband range, simultaneously has the functions of up-conversion and power amplification, improves the integration level of the circuit, reduces the power consumption of the whole circuit and effectively reduces the chip area.
Drawings
For a clearer description of the present application, one or more drawings are provided below, which are intended to aid in the background, technical principles and/or certain specific embodiments of the present application. It is noted that these drawings may or may not show some of the specific details described in the text section of the present application and which are well known to those of ordinary skill in the art; moreover, since one of ordinary skill in the art can fully integrate the text and/or drawings disclosed herein, more drawings can be devised without any inventive effort, and the following drawings may or may not cover all of the technical solutions described in the text section of this application. Furthermore, the specific meaning of these drawings is to be determined in connection with the text of the present application, and when the text of the present application does not match with some obvious structure in these drawings, it is to be comprehensively judged whether there is a pen error in the text of the present application or a drawing error in the drawings in connection with the description of the common general knowledge in the art and other parts of the present application. In particular, the following drawings are exemplary figures, and are not intended to imply the scope of protection of the present application, and those skilled in the art can devise more drawings without any inventive effort by referring to the text and/or the contents of the drawings disclosed in the present application, and the technical solutions represented by these new drawings remain within the scope of protection of the present application.
FIG. 1 is a schematic diagram of an ultra wideband high linearity up-conversion circuit in an embodiment of the present invention;
fig. 2 is a schematic diagram of the I/Q two-way double balanced mixer circuit of fig. 1.
Detailed Description
In order to facilitate understanding of the technical solutions of the present application by those skilled in the art, and at the same time, in order to make the technical objects, technical solutions and advantageous effects of the present application more clear, and to fully support the protection scope of the claims, the technical solutions of the present application are further and more detailed described in the form of specific cases below.
An ultra-wideband high-linearity up-conversion circuit is used for realizing up-conversion of two paths of signals of local oscillation and radio frequency and simultaneously meeting the requirements of ultra-bandwidth and high linearity, and comprises a plurality of I/Q two paths of active double-balanced mixer circuits which are sequentially cascaded, wherein the output of the former I/Q two paths of active double-balanced mixer circuits is used as the input of the latter I/Q two paths of active double-balanced mixer circuits, the input end of the first I/Q two paths of active double-balanced mixer circuits is empty, the output end of the last I/Q two paths of active double-balanced mixer circuits is the output of an integral circuit, the I/Q two paths of active double-balanced mixer circuits comprise a first load resistor pair, a second load resistor pair, an I path of active double-balanced mixer pair and a Q path of active double-balanced mixer pair, the I path and the Q path of active double-balanced mixer pair comprise two differential amplification pairs with tail current sources, and each tail current source is connected with a pair of complementary switching tubes;
each I/Q two-path active double-balanced mixer circuit receives an externally input radio frequency I path differential signal, a radio frequency Q path differential signal, a local oscillator I path differential signal, a local oscillator Q path differential signal and a switch control signal; the switch control signal is used for controlling the on-off of the complementary switch tube;
positive and negative signals of the radio frequency I path differential signals are respectively input to two tail current sources of the I path active double-balanced mixing pair through corresponding complementary switching tubes, the current sizes of the tail current sources are controlled, the local oscillation I path differential signals are connected to the input ends of each differential amplifying pair in the I path active double-balanced mixing pair, the switching of the currents in the differential amplifying pair is controlled, and multiplication mixing output of the local oscillation I path signals and the radio frequency I path signals is achieved;
positive and negative signals of the radio frequency Q-channel differential signals are respectively input to two tail current sources of the Q-channel active double-balanced mixing pair through corresponding complementary switching tubes, the two tail current sources are used for controlling the current magnitude of the tail current sources, the local oscillation Q-channel differential signals are connected to the input ends of each differential amplifying pair in the Q-channel active double-balanced mixing pair, the switching of the currents in the differential amplifying pair is controlled, and multiplication mixing output of the local oscillation Q-channel signals and the radio frequency Q-channel signals is realized;
the first load resistor pair is used for converting output current signals of the differential amplification pairs into voltage signals, and after the converted voltage signals corresponding to the differential amplification pairs and input signals of the I/Q two-path active double-balanced mixer circuit are overlapped together, the output signals are buffered and output through the second load resistor pair.
Specifically, as shown in fig. 1, an ultra-wideband high-linearity up-conversion circuit is formed by cascading eight identical circuit modules, and the circuit modules are I/Q two-way double-balanced mixer circuits. The input port of the module circuit is LO_I+, LO_I-, LO_Q+, LO_Q-, RF_I+, RF_I-, RF_Q+, RF_Q-; an input port: VIN1, VIN2; an output port: VO1, VO2; the principle is as follows: I/Q signals of the local oscillator and the radio frequency are input into the input ports of each module, the mixing multiplication of the local oscillator and the radio frequency signals is completed, the signals are output after being overlapped with input signals VIN1 and VIN2, the output signals are connected to the input port of the next stage, 8 modules are sequentially cascaded together, and the final stage is completed to output CLKN and CLKP.
FIG. 2 is a schematic diagram of an I/Q two-way double balanced mixer circuit, which includes a tail current source circuit composed of four transistors M9-M12, a differential amplifier pair circuit composed of four pairs of transistors M1-M8, four sets of switch circuits composed of four pairs of transistors M13-M20, and a buffer load composed of resistors R1, R2 and resistors R3, R4. The principle is as follows: the local oscillator I-path input signals are LO_I+ and LO_I-, and are respectively sent to the input ends of two differential amplification pair circuits of the I-path active double-balanced mixing pair; the input signals of the radio frequency I path are RF_I+ and RF_I-, and are input into a tail current source circuit of the I path active double-balanced mixing pair; similarly, the local oscillator Q-channel input signals are LO_Q+ and LO_Q-, and are respectively sent to the input ends of two differential amplification pair circuits of the Q-channel active double-balanced mixing pair; the RF Q input signal is RF_Q+, RF_Q-, which is input into the tail current source circuit of the Q active double balanced mixing pair.
If VLO is large enough, a pair of differential input pair transistors alternately sends the current of the tail current source circuit to the differential amplification pair for switching at the local oscillation LO frequency, so that the square wave signal of the local oscillation LO frequency and the current signal in the tail current source circuit at the radio frequency RF frequency are subjected to multiplication mixing, and the mixing output of the I/Q active double-balanced mixing pair is realized. Wherein the input end of the tail current source circuit is provided with a pair of complementary CMOS switching tubes for controlling the on-off of the circuit, the external control word can realize the switching output of the circuit under the two states of I/Q by controlling the on-off of the complementary CMOS switching tubes, and the current output is Iout (t) =sgn [ sin ]t]{2IRFsin/>t}+sgn[cos/>t]{2IRFcos/>t }, the current is converted into voltage through the load resistors R1 and R2, and after the external input signals VIN1 and VIN2 are overlapped with the I/Q two paths of active double-balanced mixing output signals, the signals are buffered and output to the signal input end of the next stage through the load resistors R3 and R4 respectively. Particularly, the complementary CMOS switching tube at the input end of the tail current source circuit not only can realize switching output in two states of I/Q, but also can play a role in weighting and superposition by controlling the on-off of the switch at the tail current source under the control of an external control code word, so that the power consumption of the whole circuit is regulated, and the linearity is regulated.
The circuit can be used for a transmitting channel in a radio frequency transceiver chip. Under the condition that no inductance-capacitance passive device is adopted, the circuit can reach about 10dBm of output power under the high-frequency condition, and a distributed resistance network is adopted, so that the resistance load of each stage is the same, the synthesis efficiency is improved, and the power consumption is reduced. In a word, the circuit breaks through the traditional up-conversion design mode, has the characteristics of small area and low power consumption, and is beneficial to chip integration.
It should be understood that the foregoing description of the specific embodiments of the present application is merely illustrative for the purpose of facilitating the understanding of the embodiments of the present application by those of ordinary skill in the art, and does not imply that the scope of protection of the present application is limited to only these examples, and that a person of ordinary skill in the art can fully understand the technical solutions of the present application to obtain more specific embodiments by combining technical features, substituting parts of technical features, adding more technical features, etc. for each of the examples listed in the present application, without any inventive effort, and all such specific embodiments are within the scope of coverage of the claims of the present application, and therefore, these new specific embodiments should also be within the scope of protection of the present application.
Moreover, for the purpose of simplifying the description, the present application may not list some common embodiments, which are naturally conceivable to those of ordinary skill in the art after understanding the technical solutions of the present application, and obviously, these solutions should also be included in the protection scope of the present application.
For the purpose of simplifying the description, the disclosure of technical details in the foregoing embodiments may only be to the extent that those skilled in the art may self-determine, that is, technical details not disclosed in the foregoing embodiments may be fully implemented by those skilled in the art without any inventive effort, under the full teachings of the present application, with the help of textbooks, specifications, papers, patents, audiovisual articles, etc., or such details may be determined by the person skilled in the art under the ordinary understanding of the present application. It can be seen that even if these technical details are not disclosed, the disclosure sufficiency of the technical solutions of the present application is not affected.
In general, any specific embodiment falling within the scope of the claims of the present application is within the scope of the present application, based on the interpretation of the claims of the present application in combination with the description of the present application.
Claims (2)
1. The ultra-wideband high-linearity up-conversion circuit is characterized by comprising a plurality of I/Q two-path active double-balanced mixer circuits which are sequentially cascaded, wherein the output of the former I/Q two-path active double-balanced mixer circuit is used as the input of the latter I/Q two-path active double-balanced mixer circuit, the I/Q two-path active double-balanced mixer circuit comprises a first load resistor pair, a second load resistor pair, an I path active double-balanced mixer pair and a Q path active double-balanced mixer pair, the I path active double-balanced mixer pair and the Q path active double-balanced mixer pair comprise two differential amplification pairs with tail current sources, and each tail current source is connected with a pair of complementary switching tubes;
each I/Q two-path active double-balanced mixer circuit receives an externally input radio frequency I path differential signal, a radio frequency Q path differential signal, a local oscillator I path differential signal, a local oscillator Q path differential signal and a switch control signal; the switch control signal is used for controlling the on-off of the complementary switch tube;
positive and negative signals of the radio frequency I path differential signals are respectively input to two tail current sources of the I path active double-balanced mixing pair through corresponding complementary switching tubes, the current sizes of the tail current sources are controlled, the local oscillation I path differential signals are connected to the input ends of each differential amplifying pair in the I path active double-balanced mixing pair, the switching of the currents in the differential amplifying pair is controlled, and multiplication mixing output of the local oscillation I path signals and the radio frequency I path signals is achieved;
positive and negative signals of the radio frequency Q-channel differential signals are respectively input to two tail current sources of the Q-channel active double-balanced mixing pair through corresponding complementary switching tubes, the two tail current sources are used for controlling the current magnitude of the tail current sources, the local oscillation Q-channel differential signals are connected to the input ends of each differential amplifying pair in the Q-channel active double-balanced mixing pair, the switching of the currents in the differential amplifying pair is controlled, and multiplication mixing output of the local oscillation Q-channel signals and the radio frequency Q-channel signals is realized;
the first load resistor pair is used for converting output current signals of the differential amplification pairs into voltage signals, and after the converted voltage signals corresponding to the differential amplification pairs and input signals of the I/Q two-path active double-balanced mixer circuit are overlapped together, the output signals are buffered and output through the second load resistor pair.
2. An ultra wideband high linearity up-conversion circuit as claimed in claim 1 wherein said I/Q two-way active double balanced mixer circuit is eight in total.
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| CN201811491703.3A CN109361361B (en) | 2018-12-07 | 2018-12-07 | Ultra-wideband high-linearity up-conversion circuit |
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| KR100374929B1 (en) * | 2000-06-02 | 2003-03-06 | 학교법인 한국정보통신학원 | Mixer |
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| US5630228A (en) * | 1995-04-24 | 1997-05-13 | Motorola, Inc. | Double balanced mixer circuit with active filter load for a portable comunication receiver |
| US5805987A (en) * | 1995-11-10 | 1998-09-08 | Nippon Electric Co | Double balanced mixer circuit with less power consumption |
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