CN106330240A - High-low local oscillation generation circuit and apparatus of achieving multiple radios - Google Patents

Abstract

The invention discloses a high-low local oscillation generation circuit and apparatus of achieving multiple radios. The high-low local oscillation generation circuit comprises a first local oscillation generation circuit group and a second local oscillation generation circuit group. The first local oscillation generation circuit group is used for controlling radio frequency switch frequency division by multiplexing a first frequency synthesizer and a divider to at least generate a first local oscillation frequency and a second local oscillation frequency. The second local oscillation generation circuit group is used for at least generating a third local oscillation frequency through using a second frequency synthesizer and multiplexing the first local oscillation generation circuit group by a selector. High frequency local oscillation multi-module multiplexing is achieved, the power consumption and the cost are greatly reduced, the power amplifier traction is reduced, and the chip performance is improved.

Description

A kind of height local oscillator generation circuit realizing many radio frequencies and device thereof

Technical field

The present invention relates to technical field of radio frequency integrated circuits, a kind of height local oscillator realizing many radio frequencies is produced Raw circuit and device thereof.

Background technology

At present, 2.4G WLAN 802.11b and bluetooth (Bluetooth, BT) system are because of radio frequency frequency Point is near, and radio frequency reception and a lot of module of transmission channel can support 2.4G with multiplexing so having on market simultaneously WLAN 802.11b and many RF ICs of Bluetooth system.But, if needing to prop up Hold other RF spot, support 2.4G, 5.8G WLAN 802.11a/b/g standard the most simultaneously And Bluetooth system, due to RF spot far apart, many RF ICs in the market are difficult To meet demand.

In order to solve produced problem, existing a kind of improve circuit methods as it is shown in figure 1, each radio frequency Frequency uses road rf integration device (SX, synthesizer), forms multipath scheme, wherein every road Rf integration device is required to integrated power amplifier (Power Amplifier, PA).But, PA is big The signal of power influences whether that ((Phase Locked Loop, PLL) locks phaselocked loop, and lock becomes Change.In order to overcome PA to frequency pulling, have employed non-local oscillator integer frequency and combine, i.e. voltage controlled oscillator The frequency of (voltage-controlled oscillator, VCO) is not the integer multiple of local frequency.So, Power consumption and the cost of radio frequency chip are all greatly increased.

Summary of the invention

In order to solve above-mentioned technical problem, the invention provides a kind of height local oscillator realizing many radio frequencies and produce Circuit and device thereof, it is possible to realize multimode multiplexing, be greatly reduced power consumption and cost.

In order to reach the object of the invention, the invention provides a kind of height local oscillator realizing many radio frequencies and produce electricity Road, including: the first local oscillator generation circuit group, it is used for by multiplexing first frequency synthesizer and divider, Control radio-frequency (RF) switch frequency dividing, at least produce first vibration frequency and the second local frequency；Second local oscillator produces Circuit group, for by second frequency synthesizer and electric by the first local oscillator generation described in selector multiplexing Road group, at least produces the 3rd local frequency.

Further, described first local oscillator generation circuit group, specifically include: first frequency synthesizer is successively It is connected in series amplifier, at least one divider, at least one selector and at least two divider； At least one radio-frequency (RF) switch is connected between first frequency synthesizer and selector.

Further, described second local oscillator generation circuit group, specifically include: second frequency synthesizer is successively Cascade amplifier, at least one divider and at least one selector；At at least one divider described even Connect the selector and division connected between at least one selector in described first local oscillator generation circuit group Device.

Further, described first frequency synthesizer is wireless frequency synthesizer WiFi SX, described first Local frequency is 2.4G WiFi/BT, and described second local frequency is 5G WiFi；Described second frequency is combined Clutch is bluetooth frequencies synthesizer BT SX, and the 3rd local frequency is bluetooth BT.

Further, transceiver local frequency f of described 2.4G WiFi_TRXLO=2.412～2.484G, described First vibration frequency f_WFSXFor:

$\frac{f_{WFSX}}{4}+\frac{f_{WFSX}}{8}=f_{TRXLO}$

$f_{WFSX}=\frac{8}{3}{f}_{TRXLO}$

f_WFSX=6.432～6.624G.

Further, transceiver local frequency f of described 5G WiFi_TRXLO=5.17～5.835G, described Two local frequencies f_WFSXFor:

$\frac{f_{WFSX}}{2}+\frac{f_{WFSX}}{4}=f_{TRXLO}$

$f_{WFSX}=\frac{4}{3}{f}_{TRXLO}$

f_WFSX=6.89～7.78G.

Further, transceiver local frequency f of described BT_TRXLO=2.402～2.480G, described 3rd Vibration frequency f_BTSXFor:

$\frac{f_{BTSX}}{2}+\frac{f_{BTSX}}{8}=f_{TRXLO}$

$f_{BTSX}=\frac{8}{5}{f}_{TRXLO}$

f_BTSX=3.2672～3.968G.

Present invention also offers a kind of height local oscillator generation circuit device realizing many radio frequencies, including: as front The described height local oscillator generation circuit realizing many radio frequencies.

Compared with prior art, the present invention includes: the first local oscillator generation circuit group, for by multiplexing the One frequency synthesizer and divider, control radio-frequency (RF) switch frequency dividing, at least produce first vibration frequency and second Local frequency；Second local oscillator generation circuit group, is used for by second frequency synthesizer, and passes through selector First local oscillator generation circuit group described in multiplexing, at least produces the 3rd local frequency.By the present invention, multiplexing Frequency synthesizer and divider, realize two frequency synthesizers by radio-frequency (RF) switch frequency dividing and cover at least three The local oscillation circuit of frequency, reduces frequency synthesizer quantity and the quantity of divider, reduce chip area and Reduce cost；Additionally, local frequency produces frequency non-integer multiple with frequency synthesizer, it is to avoid merit Rate amplifier backlash, is greatly reduced power consumption.

Other features and advantages of the present invention will illustrate in the following description, and, partly from froming the perspective of Bright book becomes apparent, or understands by implementing the present invention.The purpose of the present invention is excellent with other Point can be realized by structure specifically noted in description, claims and accompanying drawing and be obtained.

Accompanying drawing explanation

Accompanying drawing is used for providing being further appreciated by technical solution of the present invention, and constitutes one of description Point, it is used for explaining technical scheme together with embodiments herein, is not intended that the present invention The restriction of technical scheme.

Fig. 1 is the schematic diagram of a kind of many RF ICs of the prior art.

Fig. 2 be the present invention a kind of embodiment in realize the signal of height local oscillator generation circuit of many radio frequencies Figure.

Detailed description of the invention

For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing Embodiments of the invention are described in detail.It should be noted that in the case of not conflicting, this Shen Embodiment in please and the feature in embodiment can mutual combination in any.

Can be at the computer of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing System performs.And, although show logical order in flow charts, but in some cases, Can be to be different from the step shown or described by order execution herein.

Fig. 2 be the present invention a kind of embodiment in realize the signal of height local oscillator generation circuit of many radio frequencies Figure.As in figure 2 it is shown, include: the first local oscillator generation circuit group and the second local oscillator generation circuit group, wherein,

First local oscillator generation circuit group, for by multiplexing first frequency synthesizer and divider, controls to penetrate Frequency switch frequency dividing, at least produces first vibration frequency and the second local frequency；

Second local oscillator generation circuit group, is used for by second frequency synthesizer, and by selector multiplexing institute State the first local oscillator generation circuit group, at least produce the 3rd local frequency.

Specifically, in the first local oscillator generation circuit group, first frequency synthesizer be sequentially connected in series amplifier, At least one divider, at least one selector and at least two divider；At least one radio-frequency (RF) switch It is connected between first frequency synthesizer and selector；By channelized frequencies synthesizer and divider, control Radio-frequency (RF) switch frequency dividing at least produces first vibration frequency and the second local frequency.

In second local oscillator generation circuit group, second frequency synthesizer is sequentially connected in series amplifier, at least one removes Musical instruments used in a Buddhist or Taoist mass and at least one selector, connect at this at least one divider and connect between at least one selector Connect the selector in the first local oscillator generation circuit group and divider；Produced by selector multiplexing the first local oscillator The divider of circuit group, produces the 3rd local frequency.

In a particular embodiment of the present invention, this height local oscillator generation circuit realizing many radio frequencies be applied to but It is not limited to WLAN (WLAN, Wireless Local Area network), comprises 802.11a/b/g Standard, can support WiFi 2.4G and WiFi 5GHz wireless local area network (WLAN) system, and bluetooth BT simultaneously System.

WiFi/BT frequency synthesizer frequency coverage, as shown in table 1 below,

Table 1

Frequency synthesizer	BT SX	WiFi SX	Unit
				Frequency coverage	3.267～3.968	6.432～7.78	GHz

In first local oscillator generation circuit group, first frequency synthesizer is wireless frequency synthesizer (WiFi SX), Divider is except 2 circuit (DIV2), and selector is MUX selector；First vibration frequency is WiFi 2.4G, the second local frequency is WiFi 5G.

For 2.4G WiFi, transceiver local frequency f_TRXLO=2.412～2.484G,

$\frac{f_{WFSX}}{4}+\frac{f_{WFSX}}{8}=f_{TRXLO}$

$f_{WFSX}=\frac{8}{3}{f}_{TRXLO}$

f_WFSX=6.432～6.624G.

For 5G WiFi, transceiver local frequency f_TRXLO=5.17～5.835G,

$\frac{f_{WFSX}}{2}+\frac{f_{WFSX}}{4}=f_{TRXLO}$

$f_{WFSX}=\frac{4}{3}{f}_{TRXLO}$

f_WFSX=6.89～7.78G.

In second local oscillator generation circuit group, second frequency synthesizer is bluetooth frequencies synthesizer (BT SX), Divider is except 2 circuit (DIV2), and selector is MUX selector；3rd local frequency is bluetooth (BT)。

For bluetooth, transceiver local frequency f_TRXLO=2.402～2.480G,

$\frac{f_{BTSX}}{2}+\frac{f_{BTSX}}{8}=f_{TRXLO}$

$f_{BTSX}=\frac{8}{5}{f}_{TRXLO}$

f_BTSX=3.2672～3.968G.

Present invention also offers a kind of height local oscillator generation circuit device realizing many radio frequencies, including: local oscillator Producing circuit, this local oscillator generation circuit includes the first local oscillator generation circuit group and the second local oscillator generation circuit group, Wherein,

First local oscillator generation circuit group, for by multiplexing first frequency synthesizer and divider, controls to penetrate Frequency switch frequency dividing, at least produces first vibration frequency and the second local frequency；

Second local oscillator generation circuit group, is used for by second frequency synthesizer, and by selector multiplexing institute State the first local oscillator generation circuit group, at least produce the 3rd local frequency.

It should be noted that the local oscillator generation circuit realized in the height local oscillator generation circuit device of many radio frequencies Identical with the aforesaid height local oscillator generation circuit realizing many radio frequencies, therefore be not repeated herein.

In the present invention, channelized frequencies synthesizer and divider, realize two frequencies by radio-frequency (RF) switch frequency dividing Synthesizer covers the local oscillation circuit of at least three frequency, reduces frequency synthesizer quantity and the quantity of divider, Reduce chip area and reduce cost；Additionally, local frequency and frequency synthesizer generation frequency are non-whole Several times relation, it is to avoid power amplifier frequency pulling effect, is greatly reduced power consumption.

Although the embodiment that disclosed herein is as above, but described content only readily appreciates the present invention And the embodiment used, it is not limited to the present invention.Technology people in any art of the present invention Member, on the premise of without departing from the spirit and scope that disclosed herein, can be in the form implemented and thin Any amendment and change is carried out on joint, but the scope of patent protection of the present invention, still must be with appended right Claim is defined in the range of standard.

Claims (8)

1. the height local oscillator generation circuit realizing many radio frequencies, it is characterised in that including:

First local oscillator generation circuit group, for by multiplexing first frequency synthesizer and divider, controls to penetrate Frequency switch frequency dividing, at least produces first vibration frequency and the second local frequency；

Second local oscillator generation circuit group, is used for by second frequency synthesizer, and by selector multiplexing institute State the first local oscillator generation circuit group, at least produce the 3rd local frequency.

The height local oscillator generation circuit realizing many radio frequencies the most according to claim 1, it is characterised in that Described first local oscillator generation circuit group, specifically includes:

First frequency synthesizer is sequentially connected in series amplifier, at least one divider, at least one selection Device and at least two divider；

At least one radio-frequency (RF) switch is connected between first frequency synthesizer and selector.

The height local oscillator generation circuit realizing many radio frequencies the most according to claim 2, it is characterised in that Described second local oscillator generation circuit group, specifically includes:

Second frequency synthesizer is sequentially connected in series amplifier, at least one divider and at least one selector；

Connect at least one divider described and connect described first local oscillator product between at least one selector Selector in raw circuit group and divider.

The height local oscillator generation circuit realizing many radio frequencies the most according to claim 3, it is characterised in that Described first frequency synthesizer is wireless frequency synthesizer WiFi SX, and described first vibration frequency is 2.4G WiFi/BT, described second local frequency is 5G WiFi；

Described second frequency synthesizer is bluetooth frequencies synthesizer BT SX, and the 3rd local frequency is bluetooth BT。

The height local oscillator generation circuit realizing many radio frequencies the most according to claim 4, it is characterised in that Transceiver local frequency f of described 2.4G WiFi_TRXLO=2.412～2.484G,

Described first vibration frequency f_WFSXFor:

$\frac{f_{WFSX}}{4}+\frac{f_{WFSX}}{8}=f_{TRXLO}$

$f_{WFSX}=\frac{8}{3}{f}_{TRXLO}$

f_WFSX=6.432～6.624G.

6., according to the height local oscillator generation circuit realizing many radio frequencies described in claim 4, its feature exists In, transceiver local frequency f of described 5G WiFi_TRXLO=5.17～5.835G,

Described second local frequency f_WFSXFor:

$\frac{f_{WFSX}}{2}+\frac{f_{WFSX}}{4}=f_{TRXLO}$

$f_{WFSX}=\frac{4}{3}{f}_{TRXLO}$

f_WFSX=6.89～7.78G.

The height local oscillator generation circuit realizing many radio frequencies the most according to claim 4, it is characterised in that Transceiver local frequency f of described BT_TRXLO=2.402～2.480G,

Described 3rd local frequency f_BTSXFor:

$\frac{f_{BTSX}}{2}+\frac{f_{BTSX}}{8}=f_{TRXLO}$

$f_{BTSX}=\frac{8}{5}{f}_{TRXLO}$

f_BTSX=3.2672～3.968G.

8. the height local oscillator generation circuit device realizing many radio frequencies, it is characterised in that include such as right Require the height local oscillator generation circuit realizing many radio frequencies according to any one of 1～7.